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Power Integrations

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FY2020 Annual Report · Power Integrations
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2020 Annual Report

Dear Fellow Stockholders, 

At this time last year, we were just beginning to grasp the challenges that the COVID-19 pandemic would bring to our 
industry and to our lives. In the year since, we have moved to remote work arrangements for most of our employees, halted 
nearly all travel, customer visits and in-person events, weathered business interruptions at several of our suppliers, and 
experienced a sharp decline in demand followed by a steep recovery that is now straining supply chains across our industry. 
As of this writing, much of our workforce continues to work remotely as we prioritize the health of our employees and 
comply with local regulations. I look forward to a full return to our offices as soon as we are able to do so safely, but in 
the meantime I continue to be impressed with the creativity and dedication of our employees, who have not just kept our 
business on track but also delivered the best results in our history in 2020. 

Our approach to managing through the past year reflects the long-term, sustainable orientation that has always been a 
cornerstone of our success. While some of our industry peers reduced headcount or cut salaries in the early stages of the 
pandemic, we continued to invest in our people, giving normal salary raises, maintaining our generous health benefits, and 
expanding our workforce by four percent during the year, with the largest increase coming in research and development. 
(In fact, we hired a number of highly capable people let go by industry peers in the early stages of the pandemic.) We also 
invested in production capacity and infrastructure, spending more than $70 million in capital last year, including nearly 
$15 million on the construction of new facilities for our European operations and updates to our San José headquarters. 
We plan to invest $12-$15 million more in 2021 to complete our European facilities and to expand our San  José solar 
array, roughly doubling our generating capacity. 

We also built inventory as demand softened in the early stages of the pandemic, rising to 178 days on hand at the end of 
the June quarter. Building inventory is something we can afford, knowing that our products have long shelf lives and are 
fungible across applications and customers. It brings stability to our foundry relationships, helping to preserve our capacity, 
and enables us to satisfy customers when demand recovers, as has happened over the past several months. Shortages of 
semiconductor products have been a major news story of late, affecting the supply of appliances, cars, game consoles, TVs 
and  many  other  end  products.  In  our  case,  inventories  at  our  distributors  are  lower  than  normal  and  lead  times  have 
extended for some of our newer products, but we’ve thus far been able to keep most customers’ production lines running 
thanks to our timely capacity additions and our decision to build inventory last year amid falling demand. 

Our bias toward long-term thinking is most evident in our approach to R&D. About a decade ago we increased our R&D 
spending with an eye toward expanding our addressable market and developing more disruptive technologies. We did so 
knowing that the fruits of these efforts would take many years to be fully realized, and I am excited about the years ahead 
precisely because we are now beginning to see the pay-off from these long-term investments. One example is our gallium-
nitride, or GaN, technology. We were the first company to ship high-voltage GaN products in high volume when we 
introduced  GaN-based  InnoSwitch™  products  in  2018,  and  GaN-based  products  are  now  contributing  meaningful 
revenues, with about $10M in sales in 2020—a number that we expect to double or perhaps triple in 2021. Similarly, we 
began development of our BridgeSwitch™ motor-driver ICs many years ago, and will see our first meaningful revenues 
in 2021.  

A few years ago we also began developing products for the automotive market, where significant revenues are likely still 
several years away but where the opportunity is substantial. High-voltage is pervasive in electric vehicles (EVs), not just 
in the drivetrain but also charging and, in next-generation vehicles, power supplies that will drive many of the subsystems 
in  the  car  from  the  main  battery.  In  2020  we  qualified  versions  of  our  LinkSwitch™  and  InnoSwitch  products  for 
automotive use, and we continue to work closely with automakers on gate-driver products for EV drivetrains.  

The investments we have made will enable us to continue benefiting from many of the secular trends that helped drive our 
strong results in 2020. While revenues for the analog semiconductor industry grew just three percent for the year,1 our 
revenues grew 16 percent, with growth in all four end-market categories. The consumer category, our largest end market 
entering the year, grew about ten percent and finished strong, up nearly 20 percent year-over-year in the fourth quarter. 
Appliances were the main source of growth, reflecting robust end-market demand  and share gains at a broad range of 
customers, as well as rising semiconductor content. Content growth is an important secular trend in appliances driven by 
the proliferation of new features such as network connectivity, LED lighting and advanced displays, even as tighter energy-
efficiency  standards  challenge  designers  to  do  more  with  less  power,  which  in  turn  drives  even  greater  need  for  our 
products.  

1According to World Semiconductor Trade Statistics 

 
 
 
 
 
 
 
In the industrial category, demand for our high-power gate-driver products was constrained last year by pandemic-driven 
delays in infrastructure projects. However, lower revenues in high power were offset by growth in home-and-building 
automation, battery-operated tools, and broad-based industrial applications, resulting in low-single-digit growth for the 
overall category. Going forward, we expect our industrial business to benefit from secular trends such as renewable energy, 
high-voltage  DC  transmission,  electrification  of  transportation  and  tools,  smart  homes  and  buildings,  and  fixed  USB 
charging receptacles. 

The communications category grew more than 30 percent for the year, while the smaller computer category grew even 
faster, up nearly 50 percent. Some of this growth, particularly in the computer category, was the result of the work-from-
home and learn-from-home trends, which drove strong demand for PCs, tablets and monitors. Another key factor—one 
sure to endure beyond the pandemic—is the rapid adoption of advanced chargers for smartphones, tablets and notebooks. 
Power Integrations has demonstrated a commanding lead in terms of technology and product design for advanced chargers, 
and that advantage is now translating into rapid growth in market share and revenue. 

Not long ago, cellphone chargers were essentially commodities, and cost was the only variable that mattered. Today, 
OEMs are thinking strategically about chargers, either as a value-added feature or a revenue-generating accessory, and a 
wave of third-party after-market brands has emerged as well. We’ve seen this change coming for quite some time, and 
we were ready for it thanks to the R&D investments we’ve made in technologies like GaN and revolutionary products 
like InnoSwitch. In fact, while InnoSwitch ICs are used in a broad range of applications, their success in the high-volume 
smartphone market has made them the highest-selling power-supply ICs in the world, with well over a billion units 
shipped in the six years since their introduction.  

The  adoption  of  advanced  chargers  for  smartphones  accelerated  last  year  and  shows no signs  of  slowing.  Even  as 5G 
phones demand higher-power chargers due to their larger batteries, many OEMs are pushing power levels even higher to 
offer much faster charging as a way to differentiate their products. Meanwhile, we are seeing an unprecedented wave of 
innovation in charger design, including an increasing number of chargers capable of powering two or more devices, and a 
robust pipeline of designs with our GaN products. That includes our GaN-based InnoSwitch products as well as our MinE-
CAP™ ICs, which use GaN technology to reduce the size of chargers by enabling smaller input capacitors.  

Thanks in large part to our record revenues in 2020, we generated $126 million in cash flow from operations, and further 
strengthened our balance sheet, ending the year with $449 million in cash and investments. Reflecting our strong cash flow 
and healthy balance sheet, our board of directors has increased our quarterly dividend 37% over the past four quarters, 
with the payout increasing to 13 cents per share beginning in the March quarter. We also implemented a stock dividend in 
August 2020, which effectively resulted in a two-for-one stock split. Our strong financial position gives us ample flexibility 
to continue investing in our future growth while returning cash to stockholders in the years ahead. 

Thank you for your continued support of our company—I look forward to reporting on our progress in the year ahead. 

Sincerely, 

Balu Balakrishnan 
President and Chief Executive Officer 
March 2021 

The statements in this Annual Report relating to future events or results are forward-looking statements that involve many risks and uncertainties. In 
some  cases,  forward-looking  statements are  indicated  by  the use of words  such  as  “would,”  “could,”  “will,”  “may,”  “expect,”  “believe,”  “look 
forward,” “anticipate,” “outlook,” “if,” “future,” “intend,” “plan,” “estimate,” “potential,” “seek,” “scheduled,” “continue” and similar words 
and phrases, including the negatives of these terms, or other variations of these terms. Our actual results could differ materially from those contained 
in these forward-looking statements due to a number of factors, including: uncertainty and unexpected impacts of the COVID-19 pandemic; changes in 
global macroeconomic conditions; potential changes and shifts in customer demand away from end products that utilize our products; the effects of 
trade tensions and competition; the outcome and cost of patent litigation; unforeseen costs and expenses; and unfavorable fluctuations in component 
costs resulting from changes in commodity prices and/or the exchange rate between the U.S. dollar and the Japanese yen. In addition, new product 
introductions and design wins are subject to the risks and uncertainties that typically accompany development and delivery of complex technologies to 
the marketplace, including product development delays and defects and market acceptance of the new products. These and other risk factors that may 
cause actual results to differ are discussed in Part I, Item 1A — “Risk Factors” included in the Form 10-K which is part of this Annual Report. Also, 
in the Form 10-K included in this Annual Report, common stock authorized as of December 31, 2020 was incorrectly presented as 280 million shares; 
the correct number is 140 million shares.  

 
 
 
 
 
 
 
 
UNITED STATES 
SECURITIES AND EXCHANGE COMMISSION 
Washington, DC 20549 
FORM 10-K 

(Mark One) 

☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 
For the fiscal year ended December 31, 2020 

or 

☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 
1934 
For the transition period from               to               

Commission File Number 000-23441 
POWER INTEGRATIONS, INC. 
(Exact name of registrant as specified in its charter) 

Delaware 
(State or other jurisdiction of Incorporation or organization) 

94-3065014 
(I.R.S. Employer Identification No.) 

5245 Hellyer Avenue 
San Jose  ,  California 

(Address of principal executive offices) 

95138-1002 

(Zip code) 

(408) 414-9200 
(Registrant’s telephone number, including area code) 
Securities registered pursuant to Section 12(b) of the Act: 

Title of Each Class 

Common Stock 

Trading Symbol(s) 

Name of Each Exchange on Which Registered 

POWI 

The Nasdaq Global Select Market 

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes      No ☐ 

Securities registered pursuant to Section 12(g) of the Act:  None 

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ☐    No  

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 
during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing 
requirements for the past 90 days.  Yes      No  

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of 
Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes      No  

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an 
emerging  growth  company.  See  the  definitions  of  “large  accelerated  filer”,  “accelerated  filer”,  “smaller  reporting  company”  and  “emerging  growth 
company” in Rule 12b-2 of the Exchange Act: 

Large Accelerated Filer   

Non-accelerated Filer     

☐ 

Accelerated Filer    ☐ 

Smaller Reporting Company    ☐ 

Emerging Growth Company    ☐ 

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any 
new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ 

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal 
control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that 
prepared or issued its audit report.   

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ☐No  

The aggregate market value of registrant’s voting and non-voting common stock held by non-affiliates of registrant on June 30, 2020, the last business 
day of the registrant’s most recently completed second fiscal quarter, was approximately $2.6 billion, based upon the closing sale price of the common 
stock as reported on The Nasdaq Global Select Market. Shares of common stock held by each officer and director have been excluded in that such 
persons may be deemed to be affiliates. This determination of affiliate status is not a conclusive determination for other purposes. 

Outstanding shares of registrant’s common stock, $0.001 par value, as of February 2, 2021: 60,053,859. 

DOCUMENTS INCORPORATED BY REFERENCE 

The  information  required  by  Part III  of  this  report,  to  the  extent  not  set  forth  herein,  is  incorporated  by  reference  from  the  Registrant’s 
definitive proxy statement relating to the 2021 annual meeting of stockholders, which definitive proxy statement will be filed with the Securities and 
Exchange Commission within 120 days after the fiscal year to which this Report relates. 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
    
 
 
 
 
 
 
POWER INTEGRATIONS, INC. 

TABLE OF CONTENTS 

PART I. 

ITEM 1.  BUSINESS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ITEM 1A.  RISK FACTORS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ITEM 1B.  UNRESOLVED STAFF COMMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ITEM 2. 
PROPERTIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ITEM 3.  LEGAL PROCEEDINGS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ITEM 4.  MINE SAFETY DISCLOSURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PART II. 

ITEM 5.  MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS 
AND ISSUER PURCHASES OF EQUITY SECURITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SELECTED FINANCIAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  

ITEM 6. 
ITEM 7.  MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND 

RESULTS OF OPERATIONS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ITEM 7A.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK . . . . . . . . . . . .
FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ITEM 8. 
ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND 

FINANCIAL DISCLOSURE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ITEM 9A.  CONTROLS AND PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ITEM 9B.  OTHER INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PART III. 

ITEM 10.  DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE . . . . . . . . . . . . . . . . .
ITEM 11.  EXECUTIVE COMPENSATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND 

RELATED STOCKHOLDER MATTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  

ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR 

INDEPENDENCE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ITEM 14.  PRINCIPAL ACCOUNTING FEES AND SERVICES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ITEM 15.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ITEM 16.  FORM 10-K SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SIGNATURES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PART IV. 

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Cautionary Note Regarding Forward-Looking Statements 

This Annual Report on Form 10-K includes a number of forward-looking statements that involve many risks and 
uncertainties.  Forward-looking  statements  are  identified  by  the  use  of  the  words  “would,”  “could,”  “will,”  “may,” 
“expect,” “believe,” “should,” “anticipate,” “if,” “future,” “intend,” “plan,” “estimate,” “potential,” “target,” “seek” or 
“continue” and similar words and phrases, including the negatives of these terms, or other variations of these terms, that 
denote future events. These statements reflect our current views with respect to future events and our potential financial 
performance and are subject to risks and uncertainties that could cause our actual results and financial position to differ 
materially  and/or  adversely  from  what  is  projected  or  implied  in  any  forward-looking  statements  included  in  this 
Form 10-K.  These  factors  include,  but  are  not  limited  to:  the  novel  coronavirus  pandemic  (COVID-19),  which  has 
disrupted and may again disrupt our operations, including our manufacturing, research and development, and sales and 
marketing activities, which in turn could have a material adverse impact on our business and has or could exacerbate the 
risks discussed below; if demand for our products declines in our major end markets, our net revenues will decrease; our 
products are sold through distributors, which limits our direct interaction with our end customers, therefore reducing our 
ability to forecast sales and increasing the complexity of our business; we depend on third-party suppliers to provide us 
with wafers for our products, and if they fail to provide us sufficient quantities of wafers, our business may suffer; intense 
competition in the high-voltage power supply industry may lead to a decrease in our average selling price and reduced 
sales volume of our products; if our products do not penetrate additional markets, our business will not grow as we expect; 
we do not have long-term contracts with any of our customers and if they fail to place, or if they cancel or reschedule 
orders for our products, our operating results and our business may suffer; if we are unable to adequately protect or enforce 
our  intellectual  property  rights,  we  could  lose  market  share,  incur  costly  litigation  expenses,  suffer  incremental  price 
erosion or lose valuable assets, any of which could harm our operations and negatively impact our profitability; and the 
other risk factors described in Item 1A of Part I -- “Risk Factors” of this Form 10-K. We make these forward looking 
statements based upon information available on the date of this Form 10-K, and expressly disclaim any obligation to update 
or alter any forward-looking statements, whether as a result of new information or otherwise, except as required by laws. 
In  evaluating  these  statements,  you  should  specifically  consider  the  risks  described  under  Item 1A  of  Part I --  “Risk 
Factors,” Item 7 of Part II -“Management’s Discussion and Analysis of Financial Condition and Results of Operations” 
and elsewhere in this Annual Report on Form 10-K. 

 In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant 
subject. These statements are based upon information available to us as of the date of this Annual Report on Form 10-K, 
and while we believe such information forms a reasonable basis for such statements, such information may be limited or 
incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review 
of, all potentially available relevant information. These statements are inherently uncertain and investors are cautioned not 
to unduly rely upon these statements. 

3 

 
 
Item 1. Business. 

Overview 

PART I. 

We design, develop and market analog and mixed-signal integrated circuits (ICs) and other electronic components 
and circuitry used in high-voltage power conversion. Our products are used in power converters that convert electricity 
from a high-voltage source to the type of power required for a specified downstream use. In most cases, this conversion 
entails,  among  other  functions,  converting  alternating  current  (AC)  to  direct  current  (DC)  or  vice  versa,  reducing  or 
increasing the voltage, and regulating the output voltage and/or current according to the customer’s specifications. 

A large percentage of our products are ICs used in AC-DC power supplies, which convert the high-voltage AC 
from a wall outlet to the low-voltage DC required by most electronic devices. Power supplies incorporating our products 
are  used  with  all  manner  of  electronic  products  including  mobile  phones,  computing  and  networking  equipment, 
appliances, electronic utility meters, battery-powered tools, industrial controls, and “home-automation,” or “internet of 
things” applications such as networked thermostats, power strips and security devices. We also supply high-voltage LED 
drivers, which are AC-DC ICs specifically designed for lighting applications that utilize light-emitting diodes, and motor-
driver ICs addressing brushless DC (BLDC) motors used in refrigerators, HVAC systems, ceiling fans and other consumer-
appliance and light commercial applications. 

We  also  offer  high-voltage  gate  drivers—either  standalone  ICs  or  circuit  boards  containing  ICs,  electrical 
isolation components and other circuitry—used to operate high-voltage switches such as insulated-gate bipolar transistors 
(IGBTs) and silicon-carbide (SiC) MOSFETs. These combinations of switches and drivers are used for power conversion 
in high-power applications (i.e., power levels ranging from a few kilowatts up to gigawatts) such as industrial motors, 
solar- and wind-power systems, electric vehicles (EVs) and high-voltage DC transmission systems. 

Our products bring a number of important benefits to the power-conversion market compared with less advanced 
alternatives, including reduced component count and design complexity, smaller size, higher reliability and reduced time-
to-market. Our products also reduce the energy consumption of power converters during normal use and in “standby” 
operation, when  the  end  product  is not  in use.  In  addition  to  the  environmental benefits  of reduced  energy usage, our 
energy-saving  technologies  provide  a  number  of  benefits  to  our  customers;  these  include  helping  them  meet  the 
increasingly stringent efficiency standards now in effect for many electronic products, and enabling the elimination of 
bulky heatsinks used to dissipate the heat produced by wasted electricity. 

While the size of our addressable market fluctuates with changes in macroeconomic and industry conditions, the 
market has generally exhibited a modest growth rate over time as growth in the unit volume of power converters has been 
offset to a large degree by reductions in the average selling price of components in this market. Therefore, the growth of 
our business depends largely on increasing our penetration of the markets that we serve and on further expanding our 
addressable market. Our growth strategy includes the following elements: 

• 

Increase our penetration of the markets we serve. We currently address AC-DC applications with power 
outputs  up  to  approximately  500  watts,  gate-driver  applications  ranging  from  a  few  kilowatts  up  to 
gigawatts,  and  motor-drive  applications  up  to  approximately  400  watts.  Through  our  research  and 
development efforts, we seek to introduce more advanced products for these markets offering higher 
levels of integration and performance compared to earlier products. We also continue to expand our sales 
and application-engineering staff and our network of distributors, as well as our offerings of technical 
documentation and design-support tools and services to help customers use our products. These tools 
and  services  include  our  PI  Expert™  design  software,  which  we  offer  free  of  charge,  and  our 
transformer-sample service. 

Our market-penetration strategy also includes capitalizing on the importance of energy efficiency and 
renewable energy in the power conversion market. For example, our EcoSmart™ technology drastically 
reduces the amount of energy consumed by electronic products when they are not in use, helping our 
customers comply with regulations that seek to curb this so-called “standby” energy consumption. Also, 
our gate-driver products are critical components in energy-efficient DC motor drives, high-voltage DC 
transmission systems, solar and wind energy systems and electric transportation applications. 

4 

• 

Increase the size of our addressable market. Prior to 2010 our addressable market consisted of AC-DC 
applications  with  up  to  about  50  watts  of  output,  a  served  available  market  (SAM)  opportunity  of 
approximately $1.5 billion. Since that time we have expanded our SAM to more than $4 billion through 
a variety of means. These include the introduction of products that enable us to address higher-power 
AC-DC applications (such as our Hiper™ product families), the introduction of LED-driver products, 
and our entry into the gate-driver market through  the acquisition of CT-Concept Technologie AG in 
2012. In 2016 we introduced the SCALE-iDriverTM family of ICs, broadening the range of gate-driver 
applications  we  can  address,  and  in  2018  we  introduced  our  BridgeSwitch™  motor-driver  ICs, 
addressing  BLDC  motors,  as  described  above.  We  have  recently  introduced  a  series  of  automotive-
qualified  versions  of  our  products,  including  SCALE-iDriver,  InnoSwitch™  and  LinkSwitch™  ICs, 
targeting the EV market; we expect to introduce additional products targeting EVs in the future, and 
expect automotive applications to become a significant portion of our SAM over time. 

Also contributing to our SAM expansion has been the emergence of new applications within the power 
ranges that our products can address. For example, applications such as “smart” utility meters, battery-
powered lawn equipment and bicycles, and USB power receptacles (often installed alongside traditional 
AC  wall  outlets)  can  incorporate  our  products.  The  increased  use  of  electronic  intelligence  and 
connectivity in consumer appliances has also enhanced our SAM. 

Finally, we have enhanced our SAM through the development of new technologies that increase the 
value (and therefore the average selling prices) of our products. For example, our InnoSwitch™ ICs 
integrate circuitry from the secondary, or low-voltage, side of AC-DC power supplies, whereas earlier 
product  families  integrated  circuitry  only  on  the  primary,  or  high-voltage  side.  In  2019  we  began 
incorporating proprietary gallium-nitride (GaN) transistors in some our products, enabling a higher level 
of energy efficiency than ICs with traditional silicon transistors. 

We intend to continue expanding our SAM in the years ahead through all of the means described above. 

Industry Background 

Virtually every electronic device that plugs into a wall socket requires a power supply to convert the high-voltage 
alternating current provided by electric utilities into the low-voltage direct current required by most electronic devices. A 
power supply may be located inside a device, such as a consumer appliance or flat-panel TV, or it may be outside the 
device as in the case of a mobile-phone charger or an adapter for a cordless phone or cable modem. 

Until  approximately  1970,  AC-DC  power  supplies  were  generally  in  the  form  of  line-frequency,  or  linear, 
transformers. These devices, consisting primarily of copper wire wound around an iron core, tend to be bulky and heavy, 
and  typically  waste  a  substantial  amount  of  electricity.  In  the  1970s,  the  availability  of  high-voltage  discrete 
semiconductors enabled the development of a new generation of power supplies known as switched-mode power supplies, 
or  switchers.  These  switchers  generally  came  to  be  cost-effective  alternatives  to  linear  transformers  in  applications 
requiring more than a few watts of power; in recent years the use of linear transformers has declined even further as a 
result of energy-efficiency standards and higher raw-material prices. 

Switchers  are  generally  smaller,  lighter-weight  and  more  energy-efficient  than  linear  transformers.  However, 
switchers designed with discrete components are highly complex, containing numerous components and requiring a high 
level  of  analog  design  expertise.  Further,  the  complexity  and  high  component  count  of  discrete  switchers  make  them 
relatively costly, difficult to manufacture and prone to failures. Also, some discrete switchers lack protection and energy-
efficiency features; adding these features may further increase the component count, cost and complexity of the power 
supply. 

In high-power systems such as industrial motor drives, electric locomotives and renewable-energy systems, power 
conversion is typically performed using arrays of high-power silicon transistors known as IGBT modules; these modules 
are operated by electronic circuitry known as gate drivers (or IGBT drivers), whose function is to ensure accurate, safe 
and reliable operation of the IGBT modules. Much like discrete power supplies, discrete gate drivers tend to be highly 
complex, requiring a large number of components and a great deal of design expertise. 

5 

Our Highly Integrated Approach 

In 1994 we introduced TOPSwitch, the industry’s first cost-effective high-voltage IC for switched-mode AC-DC 
power  supplies.  We  have  since  introduced  a  range  of  other  product  families,  expanding  the  range  of  power-supply 
applications  we  can  serve  and  enhancing  our  competitiveness  in  applications  that  we  already  addressed.  In  2012  we 
expanded our addressable market to include high-voltage gate drivers. 

Our ICs and gate drivers drastically reduce the complexity and component count of power converters compared 
to  typical  discrete  designs  by  integrating  many  of  the  functions  otherwise  performed  by  numerous  discrete  electronic 
components,  and  by  eliminating  (or  reducing  the  size  and  cost  of)  additional  components  through  innovative  system 
design. As a result, our products enable power converters to have superior features and functionality at a total cost equal 
to or lower than that of many competing alternatives. Our products offer the following key benefits: 

• 

Fewer Components, Reduced Size and Higher Reliability 

Our highly integrated ICs and gate drivers enable designs with up to 70% fewer components than comparable 
discrete designs. This reduction in component count enhances reliability and efficiency, reduces size, and results in lower 
manufacturing costs for our customers. Power supplies that incorporate our ICs are also lighter and more portable than 
comparable power supplies built with linear transformers, which are still used in some low-power applications. 

• 

Reduced Time-to-Market, Enhanced Manufacturability 

Because our products eliminate much of the complexity associated with the design of power converters, designs 
can typically be completed in much less time, resulting in more efficient use of our customers’ design resources and shorter 
time-to-market for new designs. The lower component count and reduced complexity enabled by our products also makes 
designs  more  suitable  for  high-volume  manufacturing.  We  also  provide  extensive  hands-on  design  support  as  well  as 
online design tools, such as our PI Expert design software, that further reduce time-to-market and product development 
risks. 

• 

Energy Efficiency 

Our  patented EcoSmart  technology,  introduced  in  1998, improves  the  energy  efficiency  of  electronic  devices 
during  normal  operation  as  well  as  standby  and  “no-load”  conditions.  This  technology  enables  manufacturers  to  cost-
effectively  meet  the growing  demand  for  energy-efficient  products,  and  to  comply with  increasingly stringent  energy-
efficiency requirements. Also, our GaN transistor technology, introduced in 2019, offers substantially higher levels of 
active-mode efficiency compared to traditional silicon-based switches, while our BridgeSwitch motor-driver ICs enable 
efficiency  of  up  to  98.5 percent,  not  only  minimizing  waste  but  also  eliminating  the  need  for  heatsinks  in  many 
applications, which in turn reduces cost and weight. 

• 

Wide Power Range and Scalability 

Products in our current IC families can address AC-DC power supplies with output power up to approximately 
500 watts as well as some high-voltage DC-DC applications; our high-voltage gate drivers are used in applications with 
power levels as high as one gigawatt, while our motor-driver ICs address BLDC applications up to 300 watts. Within each 
of our product families, designers can scale up or down in power to address a wide range of designs with minimal design 
effort. 

Energy Efficiency 

Power supplies often draw significantly more electricity than the amount needed by the devices they power. As 
a  result,  billions  of  dollars’  worth  of  electricity  is  wasted  each year,  and  millions  of  tons  of  greenhouse  gases  are 
unnecessarily produced by power plants. Energy waste occurs during the normal operation of a device and in standby 
mode, when the device is plugged in but idle. For example: computers and printers waste energy while in “sleep” mode; 
TVs that are turned off by remote control consume energy while awaiting a remote-control signal to turn them back on; a 
mobile-phone charger left plugged into a wall outlet continues to draw electricity even when not connected to the phone 
(a condition known as “no-load”); and many common household appliances, such as microwave ovens, dishwashers and 
washing machines, also consume power when not in use. In fact, a 2015 study by the National Resources Defense Council 
found that devices that are “always-on” but inactive may be causing as much as $19 billion in annual energy waste in the 
United States alone. 

6 

Lighting  is  another  major  source  of  energy  waste.  Less  than  5%  of  the  energy  consumed  by  traditional 
incandescent light bulbs is converted to light, while the remainder is wasted as heat. The Alliance to Save Energy has 
estimated that a conversion to efficient lighting technologies such as compact fluorescent bulbs and LEDs could save as 
much as $18 billion worth of electricity and 158 million tons of carbon dioxide emissions per year in the United States 
alone. 

In response to concerns about the environmental impact of carbon emissions, policymakers have taken action to 
promote  energy  efficiency.  For  example,  the  ENERGY  STAR®  program  and  the  European  Union  Code  of  Conduct 
encourage  manufacturers  of  electronic  devices  to  comply  with  voluntary  energy-efficiency  specifications.  In  2007  the 
California Energy Commission (CEC) implemented mandatory efficiency standards for external power supplies. The CEC 
standards were implemented nationwide in the United States  in July 2008 as a result of the Energy Independence and 
Security Act of 2007 (EISA); these federal standards were tightened in 2016. Similar standards for external power supplies 
took effect in the European Union in 2010 as part of the EU’s EcoDesign Directive for Energy-Related Products. 

In 2010, the EU EcoDesign Directive implemented standards limiting standby power consumption on a wide 
range of electronic products. The limit was reduced by 50 percent beginning in 2013, with many products now limited to 
500  milliwatts  of  standby  usage;  further  tightening  of  the  standards  is  under  consideration.  The  EISA  legislation  also 
required substantial improvements in the efficiency of lighting technologies beginning in 2012; as of 2014, traditional 
100-, 75-, 60- and 40-watt bulbs are no longer permitted to be manufactured or sold in the United States. Plans to eliminate 
conventional incandescent bulbs have also been announced or enacted in other geographies such as Canada, Australia and 
Europe. In December 2019 the government of China published new efficiency standards for room air conditioners, which 
took effect on July 1, 2020. 

We believe we offer products that enable manufacturers to meet or exceed these regulations, and all other such 
regulations of which we are aware. Our EcoSmart technology, introduced in 1998, dramatically reduces waste in both 
operating  and  standby  modes;  we  estimate  that  this  technology  has  saved  billions  of  dollars’  worth  of  standby  power 
worldwide since 1998. In 2010 we introduced our CapZero and SenZero IC families, which eliminate additional sources 
of  standby  waste  in  some  power  supplies;  we  also  offer  a  range  of  products  designed  specifically  for  LED-lighting 
applications. 

Products 

Below is a brief description of our products: 
• 

AC-DC power conversion products 

TOPSwitch, our first commercially successful product family, was introduced in 1994. Since that time we have 
introduced a wide range of products (such as our TinySwitch, LinkSwitch and Hiper families) to increase the level of 
integration and improve upon the functionality of the original TOPSwitch, and to broaden the range of power levels we 
can  address.  In  2010  we  introduced  our  CapZero  and  SenZero  families,  which  reduce  standby  power  consumption  in 
certain applications by eliminating waste caused by so-called bleed resistors and sense resistors. We have also introduced 
products  designed  specifically  for  LED-lighting  applications,  known  as  LYTSwitch  ICs,  as  well  as  a  range  of  high-
performance, high-voltage diodes known as Qspeed diodes. 

In 2014 we introduced our InnoSwitch product family, the first power-supply ICs to combine primary, secondary 
and feedback circuits into a single package. These ICs employ a proprietary technology known as FluxLink to enable 
precise  control  without  the  need  for optical  components, which  tend  to add  cost  and diminish  the  reliability  of power 
supplies. 

This portfolio of power-conversion products generally addresses power supplies ranging from less than one watt 
of output up to approximately 500 watts of output, a market we refer to as the “low-power” market. This market consists 
of an extremely broad range of applications including mobile-device chargers, consumer appliances, utility meters, LCD 
monitors, main and standby power supplies for desktop computers and TVs, and numerous other consumer and industrial 
applications, as well as LED lighting. 

• 

High-voltage gate drivers 

We offer a range of high-voltage gate-driver products sold primarily under the SCALE and SCALE-2 product-
family  names.  These  products  are  fully  assembled  circuit  boards  incorporating  multiple  ICs,  electrical  isolation 

7 

components and other circuitry. We offer both ready-to-operate “plug-and-play” drivers designed specifically for use with 
particular  IGBT  modules,  as  well  as  “driver  cores,” which  provide  more  basic  driver functionality  that  customers can 
customize to their own specifications after purchase. In May 2016 we introduced the SCALE-iDriver family of standalone 
ICs, which enables us to address applications ranging from a few kilowatts up to about 100 kilowatts, whereas previously 
our sales of high-power products were primarily for applications above 100 kilowatts. 

• 

Motor-driver products 

The  BridgeSwitch  family  of  products,  introduced  in  2018,  is  a  family  of  motor-driver  ICs  addressing  BLDC 
motor applications up to approximately 400 watts. Such applications include refrigerator compressors, ceiling fans, air 
purifiers as well as pumps, fans and blowers used in consumer appliances such as dishwashers and laundry machines. 

Other Product Information 

TOPSwitch,  TinySwitch,  LinkSwitch,  DPA-Switch,  EcoSmart,  Hiper,  Qspeed,  InnoSwitch,  BridgeSwitch, 
SCALE, SCALE-II, SCALE-III, SCALE-iDriver, PeakSwitch, CAPZero, SENZero, ChiPhy, FluxLink, CONCEPT and 
PI Expert are trademarks of Power Integrations, Inc. 

End Markets and Applications 

Our net revenues consist primarily of sales of the products described above. When evaluating our net revenues, 
we categorize our sales into the following four major end-market groupings: communications, computer, consumer, and 
industrial. 

The table below provides the approximate mix of our net sales by end market: 

End Market 
Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Consumer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Industrial  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    

Year Ended December 31,  
2019 
 26 %    
 5 %    
 35 %    
 34 %    

2020 
 30 %    
 7 %    
 33 %    
 30 %    

2018 

 20 % 
 5 % 
 38 % 
 37 % 

Our products are used in a vast range of power-conversion applications in the above-listed end-market categories. 

The following chart lists the most prominent applications for our products in each category. 

Market Category 
Communications . .    Mobile-phone chargers, adaptors for routers, cordless phones, broadband modems, voice-over-IP 

  Primary Applications 

Computer . . . . . . . .    Desktop PCs and monitors, servers, adapters for tablets and notebook computers, other computer 

phones, other network and telecom gear 

Consumer  . . . . . . .    Major and small appliances, air conditioners, TV set-top boxes, digital cameras, TVs, video-game 

peripherals 

consoles 

Industrial . . . . . . . .    Industrial controls, LED lighting, utility meters, motor controls, uninterruptible power supplies, 

battery-powered tools, networked thermostats, power strips and other “smart home” devices, 
industrial motor drives, renewable energy systems, electric locomotives, electric buses and other 
electric vehicles, high-voltage DC transmission systems 

Sales, Distribution and Marketing 

We sell our products to original equipment manufacturers, or OEMs, and merchant power-supply manufacturers 
through our direct sales staff and a worldwide network of independent sales representatives and distributors. We have sales 
offices in the United States, United Kingdom, Germany, Italy, India, China, Japan, South Korea, the Philippines, Singapore 
and Taiwan. Direct sales to OEMs and merchant power supply manufacturers represented approximately 25%, 28% and 
25%  of  our  net  product  revenues  in  2020,  2019  and  2018,  respectively,  while  sales  to  distributors  accounted  for  the 
remainder in each of the corresponding years. Most of our distributors are entitled to return privileges based on revenues 
and are protected from price reductions affecting their inventories. Our distributors are not subject to minimum purchase 
requirements, and sales representatives and distributors can discontinue marketing our products at any time. 

8 

 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
Our sales are primarily made pursuant to standard purchase orders. The quantity of products purchased by our 
customers as well as shipment schedules are subject to revisions that reflect changes in both the customers’ requirements 
and in manufacturing availability. Historically, our business has been characterized by short-lead-time orders and quick 
delivery schedules. 

Our top ten customers, including distributors that resell to OEMs and merchant power supply manufacturers, 
accounted  for approximately 62%, 54%  and  56% of net  revenues  in 2020, 2019  and  2018,  respectively.  In 2020,  two 
distributors accounted for more than 10% of revenues. In 2019 and 2018, one of these distributors accounted for more than 
10% of revenues. 

Research and Development 

Our research and development efforts are focused on improving our technologies, introducing new products to 
expand  our  addressable  markets,  reducing  the  costs  of  existing  products,  and  improving  the  cost-effectiveness  and 
functionality  of  our  customers’  power  converters.  We  have  assembled  teams  of  highly  skilled  engineers  to  meet  our 
research and development goals. These engineers have expertise in high-voltage device structure and process technology, 
analog and digital IC design, system architecture and packaging. 

Intellectual Property and Other Proprietary Rights 

We use a combination of patents, trademarks, copyrights, trade secrets and confidentiality procedures to protect 
our intellectual-property rights. In 2020 we received 29 U.S. and 54 foreign patents. As of December 31, 2020, we held 
450 U.S. patents and 360 foreign patents. Both U.S. and foreign patents have expiration dates ranging from 2021 to 2041. 
While our patent portfolio as a whole is important to the success of our business, we are not materially dependent upon 
any single patent. We also hold trademarks in the U.S. and various other geographies including Taiwan, Korea, Hong 
Kong, China, Europe, Japan, India, and Brazil. 

We regard as proprietary some equipment, processes, information and knowledge that we have developed and 
used in the design and manufacture of our products. Our trade secrets include a high-volume production process used in 
the manufacture of our high-voltage ICs. We attempt to protect our trade secrets and other proprietary information through 
non-disclosure  agreements,  proprietary-information  agreements  with  employees  and  consultants,  and  other  security 
measures. 

Manufacturing 

We  contract  with  three  foundries  for  the  manufacture  of  the  vast  majority  of  our  silicon  wafers:  (1) Lapis 
Semiconductor Co., Ltd., or Lapis, (formerly OKI Electric Industry), (2) Seiko Epson Corporation, or Epson, (3) X-FAB 
Semiconductor  Foundries  AG,  or  X-FAB.  These  contractors  manufacture  wafers  using  our  proprietary  high-voltage 
process technologies at fabrication facilities located in Japan, Germany and the United States. 

Our ICs are assembled, packaged and tested by independent subcontractors in China, Malaysia, Thailand and the 
Philippines; a small percentage of our ICs are tested at our headquarters facility in California. Our gate-driver boards are 
assembled and tested by independent subcontractors in Sri Lanka and Thailand; some of the boards are tested at our facility 
in Switzerland. 

Our fabless manufacturing model enables us to focus on our engineering and design strengths, minimize capital 
expenditures and still have access to high-volume manufacturing capacity. We utilize both proprietary and standard IC 
packages for assembly. Some of the materials used in our packages and certain aspects of the assembly process are specific 
to our products. We require our assembly manufacturers to use high-voltage molding compounds which are more difficult 
to process than industry standard molding compounds. We work closely with our contractors on a continuous basis to 
maintain and improve our manufacturing processes. 

Our  proprietary  high-voltage  processes  do  not  require  leading-edge  geometries,  which  enables  us  to  use  our 
foundries’ older,  lower-cost facilities  for  wafer manufacturing. However,  because of our highly  sensitive  high-voltage 
process, we must interact closely with our foundries to achieve satisfactory yields. Our wafer supply agreements with 
Lapis, Epson and X-FAB expire in April 2028, December 2025 and December 2028, respectively. Under the terms of the 
Lapis and Epson agreements, each supplier has agreed to reserve a specified amount of production capacity and to sell 
wafers to us at fixed prices, which are subject to periodic review jointly by the supplier and us. In addition, Lapis and 

9 

Epson require us to supply them with a rolling six-month forecast on a monthly basis. Our agreements with Lapis and 
Epson each provide for the purchase of wafers in U.S. dollars, with mutual sharing of the impact of the fluctuations in the 
exchange rate between the Japanese yen and the U.S. dollar. Under the terms of the X-FAB agreement, X-FAB has agreed 
to reserve a specified amount of production capacity and to sell wafers to us at fixed prices, which are subject to periodic 
review  jointly  by  X-FAB  and  us.  The  agreement  with  X-FAB  also  requires  us  to  supply  them  with  rolling  six-month 
forecasts on a monthly basis. Our purchases of wafers from X-FAB are denominated in U.S. dollars. 

Although some aspects of our relationships with Lapis, Epson and X-FAB are contractual, some important aspects 
of these relationships are not written in binding contracts and depend on the suppliers’ continued cooperation. We cannot 
assure that we will continue to work successfully with Lapis, Epson or X-FAB in the future, that they will continue to 
provide  us  with  sufficient  capacity  at  their  foundries  to  meet  our  needs,  or  that  any  of  them  will  not  seek  an  early 
termination of their wafer supply agreement with us. Our operating results could suffer in the event of a supply disruption 
with one or more of our foundries if we were unable to quickly qualify alternative manufacturing sources for existing or 
new products or if these sources were unable to produce wafers with acceptable manufacturing yields. 

We typically receive shipments from our foundries approximately four to six weeks after placing orders, and lead 
times  for  new products  can be  substantially  longer.  To provide  sufficient  time  for  assembly,  testing  and  finishing, we 
typically need to receive wafers four weeks before the desired ship date to our customers. As a result of these factors and 
the fact that customers’ orders can be placed with little advance notice, we have only a limited ability to react to fluctuations 
in demand for our products. We try to carry a substantial amount of wafer and finished-goods inventory to help offset 
these risks and to better serve our markets and meet customer demand. 

Competition 

Competing alternatives to our high-voltage ICs for the power-supply market include monolithic and hybrid ICs 
from  companies  such  as  ON  Semiconductor,  STMicroelectronics,  Infineon,  and  Sanken  Electric  Company,  as  well  as 
PWM-controller  chips  paired  with  discrete  high-voltage  bipolar  transistors  and  MOSFETs;  such  controller  chips  are 
produced by a large number of vendors, including those listed above as well as such companies as NXP Semiconductors, 
Diodes Inc., On-Bright Electronics and Dialog Semiconductor. Self-oscillating switchers, built with discrete components 
supplied by numerous vendors, are also commonly used. For some applications, line-frequency transformers are also a 
competing  alternative  to  designs  utilizing  our  products.  Our  gate-driver  products  compete  with  alternatives  from  such 
companies as Avago, Infineon and Semikron, as well as driver circuits made up of discrete devices. Our motor-driver ICs 
compete with alternatives from such companies as ON Semiconductor, Infineon, STMicroelectronics and Sanken Electric 
Company. 

Generally, our products enable customers to design power converters with total bill-of-materials costs similar to 
those of competing alternatives. As a result, the value of our products is influenced by the prices of discrete components, 
which fluctuate in relation to market demand, raw-material prices and other factors, but have generally decreased over 
time. 

While we vary the pricing of our ICs in response to fluctuations in prices of alternative solutions, we also compete 
based on a variety of other factors. Most importantly, the highly integrated nature of our products enables designs that 
utilize fewer total components than comparable discrete designs or designs using other integrated or hybrid products. This 
enables power converters to be designed more quickly and manufactured more efficiently and reliably than competing 
designs. We also compete on the basis of product functionality such as safety features and energy-efficiency features and 
on the basis of the technical support we provide to our customers. This support includes hands-on design assistance as 
well as a range of design tools and documentation such as software and reference designs. We also believe that our record 
of product quality and history of delivering products to our customers on a timely basis serve as additional competitive 
advantages. 

Warranty 

We generally warrant that our products will substantially conform to the published specifications for 12 months 
from the date of shipment. Under the terms and conditions of sale, our liability is limited generally to either a credit equal 
to the purchase price or replacement of the defective part. 

10 

Human Capital 

As of December 31, 2020, we employed 725 full-time personnel across 14 countries with 363, or 50% of the 
total, residing in North America, while 50% resided offshore comprising 259 in the Asia-Pacific region and 103 across 
Europe,  Middle  East  and  Africa.  As  of  December  31,  2020,  5%  of  our  worldwide  employees  were  foreign  nationals, 
defined as individuals requiring employment visas in the countries where they are employed. Women comprise more than 
40% of our U.S. non-technical workforce. The ethnic makeup of our U.S. workforce is approximately as follows: 60% 
Asian; 29% white; 7% Hispanic or Latino; 4% other. 

Innovation is the lifeblood of our company, and we depend on our people to sustain our competitive advantage. 
We  offer  attractive  compensation  with  generous  comprehensive  benefits  for  employees  and  dependents  (including 
domestic partners), including health, dental and vision insurance, matching 401(k) contributions, employee stock plans, 
paid time off and family leave, life insurance, flu vaccinations, charitable gift matching, a health-and-wellness program 
designed  to  promote  physical  well-being,  and  an  employee  assistance  program  and  other  mental  health  services. 
Approximately 97% of eligible U.S. employees participate in our 401(k) plan. These benefits, combined with our culture 
of innovation and sustainable growth, contribute to low employee turnover and an average tenure of nearly 10 years.  

It  is  our  policy  to  ensure  equal  employment  opportunity  for  all  applicants  and  employees  without  regard  to 
prohibited  considerations  of  race,  color,  religion,  sex  (including  pregnancy,  gender  identity  and  sexual  orientation), 
national origin, age, disability or genetic information, marital status or any other classification protected by applicable 
local, state or federal laws. Our employees are encouraged to engage with company leadership and raise concerns and 
questions in-person, via e-mail (anonymously if desired), or at our quarterly employee communications meeting with the 
CEO and senior management team. All employees receive training in the prevention of sexual harassment and abusive 
conduct in the workplace. 

We value our employees, giving them the tools and training to grow as individuals, and the freedom to take risks 
in the service of innovation. We offer tuition reimbursement for job-related education and provide live and online classes 
covering  topics  such  as  communication,  leadership  and  management,  software,  and  time  management.  Subject  to 
restrictions due to the current COVID-19 pandemic, we also offer catered lunch-time workshops on a range of personal-
development topics such as financial planning, nutrition and stress management. 

Additional  information  regarding  our  commitment  to  our  people  can  be  found  on  our  website  at 

https://www.power.com/company/sustainability-citizenship/. 

Investor Information 

We make available, free of charge, copies of our annual report on Form 10-K, quarterly reports on Form 10-Q, 
current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the 
Exchange Act as soon as reasonably practicable after filing this material electronically or otherwise furnishing it to the 
SEC. Investors may obtain free electronic copies or request paper copies of these reports via the “For Investors” section 
of our website, www.power.com. Our website address is provided solely for informational purposes. We do not intend, by 
this reference, that our website should be deemed to be part of this Annual Report. The reports we file with the SEC are 
also available at www.sec.gov. 

Our corporate governance guidelines, the charters of our board committees, and our code of business conduct and 
ethics, including ethics provisions that apply to our principal executive officer, principal financial officer, controller and 
senior financial officers, are also available via the investor website listed above. These items are also available in print to 
any  stockholder  who  requests  them  by  calling  (408)  414-9200.  We  intend  to  satisfy  the  disclosure  requirements  of 
Form 8-K regarding an amendment to, or a waiver from, a provision of our code of business conduct and ethics that applies 
to  our  principal  executive  officer,  principal  financial  officer,  principal  accounting  officer  or  controller,  or  persons 
performing similar functions by posting such information on our investor website listed above. 

Power Integrations, Inc. was incorporated in California on March 25, 1988, and reincorporated in Delaware in 

December 1997. 

11 

Information About Our Executive Officers 

As of February 1, 2021, our executive officers, who are appointed by and serve at the discretion of the board of 

directors, were as follows: 

      Position With Power Integrations 

Name 
Balu Balakrishnan . . . . . . . . . . . . . . . . . . . . . . . . . . .     President, Chief Executive Officer and Director 
Douglas Bailey  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     Vice President, Marketing 
Radu Barsan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     Vice President, Technology 
Sunil Gupta  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     Vice President, Operations 
David “Mike” Matthews . . . . . . . . . . . . . . . . . . . . . .     Vice President, Product Development 
Sandeep Nayyar . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     Vice President, Finance and Chief Financial Officer  
Ben Sutherland  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     Vice President, Worldwide Sales 
Clifford Walker . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     Vice President, Corporate Development 

Age 
66 
54 
68 
48 
56 
61 
49 
69 

Balu Balakrishnan has served as president and chief executive officer and as a director of Power Integrations 
since  January 2002.  He  served  as  president  and  chief  operating  officer  from  April 2001  to  January 2002.  From 
January 2000  to  April 2001,  he  was  vice  president  of  engineering  and  strategic  marketing.  From  September 1997  to 
January 2000,  he  was  vice  president  of  engineering  and  new  business  development.  From  September 1994  to 
September 1997,  Mr. Balakrishnan  served  as  vice  president  of  engineering  and  marketing.  Prior  to  joining  Power 
Integrations in 1989, Mr. Balakrishnan was employed by National Semiconductor Corporation. 

Douglas  Bailey  has  served  as  our  vice  president  of  marketing  since  November 2004.  From  March 2001  to 
April 2004, he served as vice president of marketing at ChipX, a structured-ASIC company. His earlier experience includes 
serving as business management and marketing consultant for Sapiential Prime, Inc., director of sales and business unit 
manager for 8x8, Inc., and serving in application engineering management for IIT, Inc. and design engineering roles with 
LSI Logic, Inmos, Ltd. and Marconi. 

Radu Barsan has served as our vice president of technology since January 2013, leading our foundry engineering, 
technology development and quality organizations. Prior to joining Power Integrations, Dr. Barsan served as chairman and 
CEO at Redfern Integrated Optics, Inc., a supplier of single-frequency narrow-linewidth lasers, modules, and subsystems, 
from 2001 to 2013. Previously, he served in a succession of engineering-management and technology-development roles 
at  Phaethon  Communications, Inc.,  a  photonics  technology  company,  Cirrus  Logic, Inc.,  a  high-precision  analog  and 
digital  signal  processing  company,  Advanced  Micro  Devices,  a  semiconductor  design  company,  Cypress 
Semiconductor, Inc., a semiconductor company and Microelectronica, a semiconductor company. Dr. Barsan has 40 years 
of commercial experience in semiconductor and photonic components development, engineering and operations. 

Sunil Gupta has served as our vice president of operations since August 2020. Prior to joining Power Integrations, 
Mr. Gupta was vice president of operations at Renesas Electronics Corporation, a provider of electronics solutions, from 
July 2017 until August 2020, in which position he was responsible for global operations for Intersil and IDT products as 
well  as  the  integration  into  the  operations  of  Renesas.  Prior  to  joining  Renesas  he  was  Senior  Vice  President,  Global 
Operations at Intersil Corporation, a developer of power management and precision analog integrated circuits, from June 
2016 to July 2017, in which position he led the global operations and technology teams, and was Vice President, Quality 
and Technology Development at Intersil was from September 2013 to June 2016, in which position he led the quality, 
reliability,  yield,  process  technology  and  package  technology  teams.  Mr.  Gupta  joined  Intersil  in  2012  as  its  Vice 
President, Quality and Reliability.  Prior to joining Intersil, Mr. Gupta was the Director of Worldwide Customer Quality 
Engineering at Qualcomm, and prior to Qualcomm Mr. Gupta spent 16 years at National Semiconductor in wafer fab 
operations and quality. 

Mike Matthews has served as our vice president of product development since August 2012. Mr. Matthews joined 
Power  Integrations  in  1992,  managing  our  European  application-engineering  group  and  then  our  European  sales 
organization as managing director of Power Integrations (Europe). He has led our product-definition team since 2000, 
serving  as  director  of  strategic  marketing  prior  to  assuming  his  current  role.  Prior  to  joining  Power  Integrations, 
Mr. Matthews worked at several electric motor-drive companies and then at Siliconix, a semiconductor company, as a 
motor-control applications specialist. 

12 

 
 
 
 
 
     
  
  
  
  
  
  
  
 
Sandeep Nayyar has served as our vice president and chief financial officer since June 2010. From 2002 to 2009 
Mr. Nayyar served as vice president of finance at Applied Biosystems, Inc., a developer and manufacturer of life-sciences 
products, where he was a member of the executive team with world-wide responsibilities for finance. From 1990 to 2001, 
Mr. Nayyar  served  in  a  succession  of  financial  roles  including  vice  president  of  finance  at  Quantum  Corporation,  a 
computer storage company. Mr. Nayyar also worked for five years in the public-accounting field at Ernst & Young LLP. 
Mr. Nayyar is a Certified Public Accountant, Chartered Accountant and has a Bachelor of Commerce from the University 
of Delhi, India. Since 2014, Mr. Nayyar has served as a director and audit-committee chairman of Smart Global Holdings, 
Inc., a manufacturer of specialty memory solutions; in 2021 he was named lead independent director. 

Ben  Sutherland  has  served  as  our  vice president, worldwide  sales  since July 2011.  Mr. Sutherland  joined our 
company in May 2000 as a member of our sales organization in Europe. From May 2000 to July 2011, Mr. Sutherland 
served in various sales positions responsible primarily for our international sales, and more recently for domestic sales. 
From 1997 to 2000, Mr. Sutherland served in various product marketing and sales roles at Vishay Intertechnology, Inc., a 
manufacturer and supplier of discrete semiconductors and passive electronic components. 

Clifford Walker has served as our vice president, corporate development since June 1995. From September 1994 
to  June 1995,  Mr. Walker  served  as  vice  president  of  Reach  Software  Corporation,  a  software  company.  From 
December 1993  to  September 1994,  Mr. Walker  served  as  president  of  Morgan  Walker  International,  a  consulting 
company. 

Item 1A. Risk Factors. 

The  following  are  important  factors  that  could  cause  actual  results  or  events  to  differ  materially  from  those 
contained in any forward-looking statements made by us or on our behalf. The risks and uncertainties described below 
are not the only ones we face. Additional risks and uncertainties not presently known to us or that we deem immaterial 
also may impair our business operations. If any of the following risks or such other risks actually occurs, our business 
could be harmed. 

Risks Related to Ownership of Our Common Stock 

Our operating results are volatile and difficult to predict. If we fail to meet the expectations of public market 
analysts or investors, the market price of our common stock may decrease significantly. Our net revenues and operating 
results have varied significantly in the past, are difficult to forecast, are subject to numerous factors both within and outside 
of  our  control,  and  may  fluctuate  significantly  in  the  future.  As  a  result,  our  operating  results  could  fall  below  the 
expectations of public market analysts or investors. If that occurs, the price of our stock may decline. 

Some of the factors that could affect our operating results include the following: 
• 

we face risks related to the Novel Coronavirus pandemic (COVID-19), which has disrupted and may 
again  disrupt  our  operations,  including  our  manufacturing,  research  and  development,  and  sales  and 
marketing activities, which could have a material adverse impact on our business, financial condition, 
operating results and cash flows; 

• 

• 
• 

• 
• 

• 

• 
• 

the  volume  and  timing  of  delivery  of  orders  placed  by  us  with  our  wafer  foundries  and  assembly 
subcontractors, and their ability to procure materials; 

the volume and timing of orders received from customers; 

our products are sold through distributors, which limits our direct interaction with our end customers, 
which reduces our ability to forecast sales and increases the complexity of our business; 

reliance on international sales activities for a substantial portion of our net revenues; 

competitive pressures on selling prices; 

the ability of our products to penetrate additional markets; 

our ability to develop and bring to market new products and technologies on a timely basis; 

the lengthy timing of our sales cycle; 

13 

 
 
• 

• 

• 
• 

• 

• 
• 

• 

• 
• 

• 

• 

• 

• 

the  demand  for  our  products  declining  in  the  major  end  markets  we  serve,  which  may  occur  due  to 
competitive factors, supply-chain fluctuations or changes in macroeconomic conditions; 

our ability to attract and retain qualified personnel; 

interruptions in our information technology systems; 

earthquakes, terrorists acts, pandemic or other disasters; 

fluctuations in exchange rates, particularly the exchange rate between the U.S. dollar and the Japanese 
yen, the Euro and the Swiss franc; 

the inability to adequately protect or enforce our intellectual property rights; 

expenses  we  are  required  to  incur  (or  choose  to  incur)  in  connection  with  our  intellectual  property 
litigations; 

undetected defects and failures in meeting the exact specifications required by our products; 

risks associated with acquisitions and strategic investments; 

our ability to successfully integrate, or realize the expected benefits from, our acquisitions; and 

changes  in  tax  rules and  regulations,  changes  in  interpretation  of  tax  rules and  regulations,  or 
unfavorable assessments from tax audits may increase the amount of taxes we are required to pay; 

changes  in  environmental  laws  and  regulations,  including  with  respect  to  energy  consumption  and 
climate change; 

continued impact of changes in securities laws and regulations, including potential risks resulting from 
our evaluation of our internal controls over financial reporting; and 

uncertainties arising out of economic consequences of current and potential military actions or terrorist 
activities and associated political instability. 

Risks Related to the Operation and Growth of Our Business 

We  face  risks  related  to  the  Novel  Coronavirus  pandemic  (COVID-19),  which  has  disrupted  and  may  again 
disrupt our operations, including our manufacturing, research and development, and sales and marketing activities, which 
could have a material adverse impact on our business, financial condition, operating results and cash flows. Our business 
as well as the business of our suppliers, customers and distributors have been and may continue to be adversely impacted 
by the world-wide response to COVID-19 such as public health measures, travel restrictions, business shutdowns, border 
closures, delivery and freight delays and other disruptions. These disruptions may adversely affect not only our sales and 
marketing  activities,  product  development,  manufacturing  and  product  shipments  which  could  negatively  impact  our 
ability to meet customer commitments but also our customers’ ability to manufacture their products, which could reduce 
their demand for our products. The effects of the pandemic have resulted in a significant economic downturn in local and 
global economies, as well as a significant downturn in financial markets, and the continuing pandemic could result in 
further  significant  economic  downturns  which  may  result  in  reduced  end-customer  demand  and  materially  impact  our 
revenues. All of these effects could have a material adverse effect on our customer relationships, operating results, cash 
flows, financial condition and have a negative impact on our stock price. 

We  depend  on  third-party  suppliers  to  provide  us  with  wafers  for  our  products  and  if  they  fail  to  provide  us 
sufficient quantities of wafers, our business may suffer. Our primary supply arrangements for the production of wafers are 
with Epson, Lapis, and X-FAB. Our contracts with these suppliers expire on varying dates, with the earliest to expire in 
December 2025.  Although  some  aspects  of  our  relationships  with  Lapis,  X-FAB  and  Epson  are  contractual,  many 
important aspects of these relationships depend on their continued cooperation. We cannot assure that we will continue to 
work successfully with Epson, Lapis and X-FAB in the future, and that the wafer foundries’ capacity will meet our needs. 
Additionally, one or more of these wafer foundries could seek an early termination of our wafer supply agreements. Any 
serious disruption in the supply of wafers from Epson, Lapis and X-FAB could harm our business. We estimate that it 
would  take  12  to  24 months  from  the  time  we  identified  an  alternate  manufacturing  source  to  produce  wafers  with 
acceptable manufacturing yields in sufficient quantities to meet our needs. 

14 

Although we provide our foundries with rolling forecasts of our production requirements, their ability to provide 
wafers to us is ultimately limited by the available capacity of the wafer foundry. Any reduction in wafer foundry capacity 
available to us could require us to pay amounts in excess of contracted or anticipated amounts for wafer deliveries or 
require us to make other concessions to meet our customers’ requirements, or may limit our ability to meet demand for 
our products. Further, to the extent demand for our products exceeds wafer foundry capacity, this could inhibit us from 
expanding our business and harm relationships with our customers. Any of these concessions or limitations could harm 
our business. 

If our third-party suppliers and independent subcontractors do not produce our wafers and assemble our finished 
products at acceptable yields, our net revenues may decline. We depend on independent foundries to produce wafers, and 
independent subcontractors to assemble and test finished products, at acceptable yields and to deliver them to us in a timely 
manner. The failure of the foundries to supply us wafers at acceptable yields could prevent us from selling our products to 
our customers and would likely cause a decline in our net revenues and gross margin. In addition, our IC assembly process 
requires our manufacturers to use a high-voltage molding compound that has been available from only a few suppliers. 
These compounds and their specified processing conditions require a more exacting level of process control than normally 
required  for  standard  IC  packages.  Unavailability  of  assembly  materials  or  problems  with  the  assembly  process  can 
materially and adversely affect yields, timely delivery and cost to manufacture. We may not be able to maintain acceptable 
yields in the future. 

In  addition,  if  prices  for  commodities  used  in  our  products  increase  significantly,  raw  material  costs  would 
increase for our suppliers which could result in an increase in the prices our suppliers charge us. To the extent we are not 
able to pass these costs on to our customers; this would have an adverse effect on our gross margins. 

We  do  not  have  long-term  contracts  with  any  of  our  customers  and  if  they  fail  to  place,  or  if  they  cancel  or 
reschedule orders for our products, our operating results and our business may suffer. Our business is characterized by 
short-term customer orders and shipment schedules, and the ordering patterns of some of our large customers have been 
unpredictable in the past and will likely remain unpredictable in the future. Not only does the volume of units ordered by 
particular customers vary substantially from period to period, but also purchase orders received from particular customers 
often vary substantially from early oral estimates provided by those customers for planning purposes. In addition, customer 
orders  can  be  canceled  or  rescheduled  without  significant  penalty  to  the  customer.  In  the  past,  we  have  experienced 
customer cancellations of substantial orders for reasons beyond our control, and significant cancellations could occur again 
at any time. Also, a relatively small number of distributors, OEMs and merchant power supply manufacturers account for 
a significant portion of our revenues. Specifically, our top ten customers, including distributors, accounted for 62%, 54% 
and 56% of our net revenues in each of the years ended December 31, 2020, 2019 and 2018, respectively. However, a 
significant portion of these revenues are attributable to sales of our products through distributors of electronic components. 
These distributors sell our products to a broad, diverse range of end users, including OEMs and merchant power supply 
manufacturers, which mitigates the risk of customer concentration to a large degree. 

Our products are sold through distributors, which limits our direct interaction with our end customers, therefore 
reducing our ability to forecast sales and increasing the complexity of our business. Sales to distributors accounted for 
approximately 75%, 72% and 75% of net revenues in the years ended December 31, 2020, 2019 and 2018, respectively. 
Selling through distributors reduces our ability to forecast sales and increases the complexity of our business, requiring us 
to: 

• 

• 
• 

manage a more complex supply chain; 

monitor the level of inventory of our products at each distributor, and 

monitor  the  financial  condition  and  credit-worthiness  of  our  distributors,  many  of  which  are  located 
outside of the United States and are not publicly traded. 

Since we have limited ability to forecast inventory levels at our end customers, it is possible that there may be 
significant build-up of inventories in the distributor channel, with the OEM or the OEM’s contract manufacturer. Such a 
buildup  could  result  in  a  slowdown  in  orders,  requests  for  returns  from  customers,  or  requests  to  move  out  planned 
shipments. This could adversely impact our revenues and profits. Any failure to manage these complexities could disrupt 
or reduce sales of our products and unfavorably impact our financial results. 

15 

Our  international  sales  activities  account  for  a  substantial  portion  of  our  net  revenues,  which  subjects  us  to 
substantial risks. Sales to customers outside of the United States of America account for, and have accounted for a large 
portion  of  our  net  revenues,  including  approximately  98%,  97%  and  96%  of  our  net  revenues  for  the year  ended 
December 31, 2020, 2019 and 2018. If our international sales declined and we were unable to increase domestic sales, our 
revenues would decline and our operating results would be harmed. International sales involve a number of risks to us, 
including: 
• 
• 

tariffs, protectionist measures and other trade barriers and restrictions; 

potential insolvency of international distributors and representatives; 

• 

• 
• 

• 

reduced protection for intellectual property rights in some countries; 

the impact of recessionary environments in economies outside the United States; 

the burdens of complying with a variety of foreign and applicable U.S. Federal and state laws; and 

foreign-currency exchange risk. 

Our failure to adequately address these risks could reduce our international sales and materially and adversely 
affect our operating results. Furthermore, because substantially all of our foreign sales are denominated in U.S. dollars, 
increases in the value of the dollar cause the price of our products in foreign markets to rise, making our products more 
expensive relative to competing products priced in local currencies. 

Intense competition in the high-voltage power supply industry may lead to a decrease in our average selling price 
and  reduced  sales  volume  of  our  products.  The  high-voltage  power  supply  industry  is  intensely  competitive  and 
characterized by significant price sensitivity. Our products face competition from alternative technologies, such as linear 
transformers,  discrete  switcher  power  supplies,  and  other  integrated  and  hybrid  solutions.  If  the  price  of  competing 
solutions decreases significantly, the cost effectiveness of our products will be adversely affected. If power requirements 
for applications in which our products are currently utilized go outside the cost-effective range of our products, some of 
these alternative technologies can be used more cost effectively. In addition, as our patents expire, our competitors could 
legally begin using the technology covered by the expired patents in their products, potentially increasing the performance 
of  their  products  and/or  decreasing  the  cost  of  their  products,  which  may  enable  our  competitors  to  compete  more 
effectively. Our current patents may or may not inhibit our competitors from getting any benefit from an expired patent. 
Our U.S. patents have expiration dates ranging from 2020 to 2039. We cannot assure that our products will continue to 
compete favorably or that we will be successful in the face of increasing competition from new products and enhancements 
introduced by existing competitors or new companies entering this market. We believe our failure to compete successfully 
in the high-voltage power supply business, including our ability to introduce new products with higher average selling 
prices, would materially harm our operating results. 

If our products do not penetrate additional markets, our business will not grow as we expect. We believe that our 
future success depends in part upon our ability to penetrate additional markets for our products. We cannot assure that we 
will be able to overcome the marketing or technological challenges necessary to penetrate additional markets. To the extent 
that a competitor penetrates additional markets before we do, or takes market share from us in our existing markets, our 
net revenues and financial condition could be materially adversely affected. 

If our efforts to enhance existing products and introduce new products are not successful, we may not be able to 
generate demand for our products. Our success depends in significant part upon our ability to develop new ICs for high-
voltage power conversion for existing and new markets, to introduce these products in a timely manner and to have these 
products selected for design into products of leading manufacturers. New product introduction schedules are subject to the 
risks and uncertainties that typically accompany development and delivery of complex technologies to the market place, 
including product development delays and defects. If we fail to develop and sell new products in a timely manner, then 
our net revenues could decline. 

In addition, we cannot be sure that we will be able to adjust to changing market demands as quickly and cost-
effectively as necessary to compete successfully. Furthermore, we cannot assure that we will be able to introduce new 
products in a timely and cost-effective manner or in sufficient quantities to meet customer demand or that these products 
will achieve market acceptance. Our failure, or our customers’ failure, to develop and introduce new products successfully 
and in a timely manner would harm our business. In addition, customers may defer or return orders for existing products 

16 

in response to the introduction of new products. When a potential liability exists we will maintain reserves for customer 
returns, however we cannot assure that these reserves will be adequate. 

Because the sales cycle for our products can be lengthy, we may incur substantial expenses before we generate 
significant  revenues,  if  any.  Our  products  are  generally  incorporated  into  a  customer’s  products  at  the  design  stage. 
However, customer decisions to use our products, commonly referred to as design wins, can often require us to expend 
significant  research  and  development  and  sales  and  marketing  resources  without  any  assurance  of  success.  These 
significant research and development and sales and marketing resources often precede volume sales, if any, by a year or 
more. The value of any design win will largely depend upon the commercial success of the customer’s product. We cannot 
assure that we will continue to achieve design wins or that any design win will result in future revenues. If a customer 
decides at the design stage not to incorporate our products into its product, we may not have another opportunity for a 
design win with respect to that product for many months or years. 

If demand for our products declines in our major end markets, our net revenues will decrease. A limited number 
of applications of our products, such as cellphone chargers and consumer appliances, make up a significant percentage of 
our net revenues. We expect that a significant level of our net revenues and operating results will continue to be dependent 
upon these applications in the near term. The demand for these products has been highly cyclical and has been impacted 
by economic downturns in the past. Any economic slowdown in the end markets that we serve could cause a slowdown in 
demand for our ICs. When our customers are not successful in maintaining high levels of demand for their products, their 
demand for our ICs decreases, which adversely affects our operating results. Any significant downturn in demand in these 
markets would cause our net revenues to decline and could cause the price of our stock to fall. 

We must attract and retain qualified personnel to be successful and competition for qualified personnel is intense 
in our market. Our success depends to a significant extent upon the continued service of our executive officers and other 
key management and technical personnel, and on our ability to continue to attract, retain and motivate qualified personnel, 
such as experienced analog design engineers and systems applications engineers. The competition for these employees is 
intense, particularly in Silicon Valley. The loss of the services of one or more of our engineers, executive officers or other 
key personnel could harm our business. In addition, if one or more of these individuals leaves our employ, and we are 
unable to quickly and efficiently replace those individuals with qualified personnel who can smoothly transition into their 
new roles, our business may suffer. We do not have long-term employment contracts with, and we do not have in place 
key person life insurance policies on, any of our employees. 

Interruptions in our information technology systems could adversely affect our business. We rely on the efficient 
and  uninterrupted  operation  of  complex  information  technology  systems  and  networks  to  operate  our  business.  Any 
significant  system  or  network  disruption,  including but not  limited  to  new  system  implementations,  computer  viruses, 
security breaches, or energy blackouts could have a material adverse impact on our operations, sales and operating results. 
We have implemented measures to manage our risks related to such disruptions, but such disruptions could still occur and 
negatively impact our operations and financial results. In addition, we may incur additional costs to remedy any damages 
caused by these disruptions or security breaches. 

In the event of an earthquake, terrorist act, another pandemic or other disaster, our operations may be interrupted 
and our business would be harmed. Our principal executive offices and operating facilities are situated near San Francisco, 
California, and most of our major suppliers, which are wafer foundries and assembly houses, are located in areas that have 
been subject to severe earthquakes, such as Japan. Many of our suppliers are also susceptible to other disasters such as 
tropical storms, typhoons or tsunamis. In the event of a disaster, such as the earthquake and tsunami in Japan, we or one 
or  more  of  our  major  suppliers  may  be  temporarily  unable  to  continue  operations  and  may  suffer  significant  property 
damage. Any interruption in our ability or that of our major suppliers to continue operations could delay the development 
and shipment of our products and have a substantial negative impact on our financial results. 

Risks Related to Financial Performance or General Economic Conditions 

Fluctuations in exchange rates, particularly the exchange rate between the U.S. dollar and the Japanese yen, 
Swiss franc and euro, may impact our gross margin and net income. Our exchange rate risk related to the Japanese yen 
includes two of our major suppliers, Epson and Lapis, with which we have wafer supply agreements based in U.S. dollars; 
however, these agreements also allow for mutual sharing of the impact of the exchange rate fluctuation between Japanese 
yen  and  the  U.S.  dollar.  Each year,  our  management  and  these  suppliers  review  and  negotiate  pricing;  the  negotiated 
pricing  is  denominated  in  U.S.  dollars  but  is  subject  to  contractual  exchange  rate  provisions.  The  fluctuation  in  the 
exchange rate is shared equally between Power Integrations and each of these suppliers. We maintain cash denominated 

17 

in Swiss francs and euros to fund the operations of our Swiss subsidiary. The functional currency of our Swiss subsidiary 
is the U.S. dollar; gains and losses arising from the re-measurement of non-functional currency balances are recorded in 
other income in our consolidated statements of income, and material unfavorable exchange-rate fluctuations with the Swiss 
franc could negatively impact our net income. 

If we are unable to adequately protect or enforce our intellectual property rights, we could lose market share, 
incur costly litigation expenses, suffer incremental price erosion or lose valuable assets, any of which could harm our 
operations and negatively impact our profitability. Our success depends upon our ability to continue our technological 
innovation  and  protect  our  intellectual  property,  including  patents,  trade  secrets,  copyrights  and  know-how.  We  are 
currently  engaged  in  litigation  to  enforce  our  intellectual  property  rights,  and  associated  expenses  have  been,  and  are 
expected to remain, material and have adversely affected our operating results. We cannot assure that the steps we have 
taken  to  protect  our  intellectual property will  be  adequate  to prevent misappropriation,  or  that others  will not develop 
competitive  technologies  or  products.  From  time  to  time,  we  have  received,  and  we  may  receive  in  the  future, 
communications alleging possible infringement of patents or other intellectual property rights of others. Costly litigation 
may be necessary to enforce our intellectual property rights or to defend us against claimed infringement. The failure to 
obtain necessary licenses and other rights, and/or litigation arising out of infringement claims could cause us to lose market 
share and harm our business. 

As  our  patents  expire,  we  will  lose  intellectual  property  protection  previously  afforded  by  those  patents. 
Additionally, the laws of some foreign countries in which our technology is or may in the future be licensed may not 
protect our intellectual property rights to the same extent as the laws of the United States, thus limiting the protections 
applicable to our technology. 

If we do not prevail in our litigation, we will have expended significant financial resources, potentially without 
any benefit, and may also suffer the loss of rights to use some technologies. We are currently involved in a number of 
patent litigation matters and the outcome of the litigation is uncertain. See Note 13, Legal Proceedings and Contingencies, 
in our Notes to Consolidated Financial Statements included in this Annual Report on Form 10-K. For example, we are 
being sued in an ongoing case for patent infringement. Should we ultimately be determined to be infringing another party’s 
patents, or if an injunction is issued against us while litigation is pending on those claims, such result could have an adverse 
impact on our ability to sell products found to be infringing, either directly or indirectly. In the event of an adverse outcome, 
we may be required to pay substantial damages, stop our manufacture, use, sale, or importation of infringing products, or 
obtain licenses to the intellectual property we are found to have infringed. We have also incurred, and expect to continue 
to incur, significant legal costs in conducting these lawsuits, including the appeal of the case we won, and our involvement 
in  this  litigation  and  any  future  intellectual  property  litigation  could  adversely  affect  sales  and  divert  the  efforts  and 
attention of our technical and management personnel, whether or not such litigation is resolved in our favor. Thus, even if 
we are successful in these lawsuits, the benefits of this success may fail to outweigh the significant legal costs we will 
have incurred. 

Our products must meet exacting specifications, and undetected defects and failures may occur which may cause 
customers to return or stop buying our products and/or impose significant costs to us. Our customers generally establish 
demanding specifications for quality, performance and reliability, and our products must meet these specifications. ICs as 
complex as those we sell often encounter development delays and may contain undetected defects or failures when first 
introduced or after commencement of commercial shipments. We have from time to time in the past experienced product 
quality, performance or reliability problems. If defects and failures occur in our products, we could experience lost revenue, 
increased costs, including product warranty or liability claims and costs associated with customer support and product 
recalls,  delays  in  or  cancellations  or  rescheduling  of  orders  or  shipments  and  product  returns  or  discounts.  While  we 
specifically exclude consequential damages in our standard terms and conditions, certain of our contracts may not exclude 
such  liabilities.  Our  liability insurance which  covers  certain  damages  arising out  of product  defects may not  cover  all 
claims or be of a sufficient amount to fully protect against such claims. Costs or payments in connection with such claims 
could harm our operating results. 

We are exposed to risks associated with acquisitions and strategic investments. We have made, and in the future 
intend  to  make,  acquisitions  of,  and  investments  in,  companies,  technologies  or  products  in  existing,  related  or  new 
markets. Acquisitions involve numerous risks, including but not limited to: 

• 

inability to realize anticipated benefits, which may occur due to any of the reasons described below, or 
for other unanticipated reasons 

18 

• 

• 

• 

the risk of litigation or disputes with customers, suppliers, partners or stockholders of an acquisition 
target arising from a proposed or completed transaction; 

impairment  of  acquired  intangible  assets  and  goodwill  as  a  result  of  changing  business  conditions, 
technological  advancements  or  worse-than-expected  performance,  which  would  adversely  affect  our 
financial results; and 

unknown, underestimated and/or undisclosed commitments, liabilities or issues not discovered in our 
due diligence of such transactions. 

We also in the future may have strategic relationships with other companies, which may decline in value and/or 
not meet desired objectives. The success of these strategic relationships depends on various factors over which we may 
have  limited  or  no  control  and  requires  ongoing  and  effective  cooperation  with  strategic  partners.  Moreover,  these 
relationships are often illiquid, such that it may be difficult or impossible for us to monetize such relationships. 

Our inability to successfully integrate, or realize the expected benefits from, our acquisitions could adversely 
affect  our  results. We  have  made,  and  in  the  future  intend  to  make,  acquisitions  of  other  businesses  and  with  these 
acquisitions there is a risk that integration difficulties may cause us not to realize expected benefits. The success of the 
acquisitions could depend, in part, on our ability to realize the anticipated benefits and cost savings (if any) from combining 
the businesses of the acquired companies and our business, which may take longer to realize than expected. 

Risks Related to Laws and Regulations 

Changes  in  tax  rules and  regulations,  changes  in  interpretation  of  tax  rules and  regulations,  or  unfavorable 
assessments from tax audits may increase the amount of taxes we are required to pay. Our operations are subject to income 
and transaction taxes in the United States and in multiple foreign jurisdictions and to review or audit by the U.S. Internal 
Revenue Service (IRS) and state, local and foreign tax authorities. In addition, the United States, countries in Asia and 
other countries where we do business have recently enacted or are considering changes in relevant tax, accounting and 
other laws, regulations and interpretations, including changes to tax laws applicable to multinational companies. These 
potential changes could adversely affect our effective tax rates or result in other costs to us. 

Recently  enacted  U.S.  tax  legislation  has  significantly  changed  the  taxation  of  U.S.-based  multinational 
corporations, by, among other things, reducing the U.S. corporate income tax rate, adopting elements of a territorial tax 
system, assessing a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred, 
and the creation of new taxes on certain foreign-sourced earnings. The legislation as initially enacted was unclear in some 
respects and has required interpretations and implementing regulations by the Internal Revenue Service, as well as state 
tax authorities, and the legislation has been subject to amendments and technical corrections. Further amendments and 
technical  corrections  may  occur,  any  of  which  could  lessen  or  increase  certain  adverse  impacts  of  the  legislation.  A 
significant portion of our earnings are earned by our subsidiaries outside the U.S. Changes to the taxation of certain foreign 
earnings  resulting  from  the  newly  enacted  U.S.  tax  legislation,  along  with  the  state  tax  impact  of  these  changes  and 
potential  future  cash  distributions,  may  have  an  adverse  effect  on  our  effective  tax  rate.  Furthermore,  changes  to  the 
taxation of undistributed foreign earnings could change our future intentions regarding reinvestment of such earnings. The 
foregoing items could have a material effect on our business, cash flow, results of operations or financial conditions. 

Changes  in  environmental  laws  and  regulations  may  increase  our  costs  related  to  obsolete  products  in  our 
existing  inventory.  Changing  environmental  regulations  and  the  timetable  to  implement  them  continue  to  impact  our 
customers’  demand  for  our  products.  As  a  result,  there  could  be  an  increase  in  our  inventory  obsolescence  costs  for 
products manufactured prior to our customers’ adoption of new regulations. Currently we have limited visibility into our 
customers’  strategies  to  implement  these  changing  environmental  regulations  into  their  business.  The  inability  to 
accurately determine our customers’ strategies could increase our inventory costs related to obsolescence. 

General Risk Factors 

Securities laws and regulations, including potential risk resulting from our evaluation of internal controls over 
financial reporting, will continue to impact our results. Complying with the requirements of the federal securities laws 
and  Nasdaq’s  conditions  for  continued  listing  have  imposed  significant  legal  and  financial  compliance  costs,  and  are 
expected to continue to impose significant costs and management burden on us. These rules and regulations also may make 
it  more  expensive  for  us  to  obtain  director  and  officer  liability  insurance,  and  we  may  be  required  to  accept  reduced 
coverage  or  incur  substantially  higher  costs  to  obtain  coverage.  These  rules and  regulations  could  also  make  it  more 

19 

difficult for us to attract and retain qualified executive officers and members of our board of directors, particularly qualified 
members to serve on our audit committee. Further, the rules and regulations under the Dodd-Frank Wall Street Reform 
and Consumer Protection Act, which became effective in 2011, may impose significant costs and management burden on 
us. 

Additionally, because these laws, regulations and standards are expected to be subject to varying interpretations, 
their  application  in  practice  may  evolve  over  time  as  new  guidance  becomes  available.  This  evolution  may  result  in 
continuing  uncertainty  regarding  compliance  matters  and  additional  costs  necessitated  by  ongoing  revisions  to  our 
disclosure and governance practices. 

Uncertainties  arising  out  of  economic  consequences  of  current  and  potential  military  actions  or  terrorist 
activities and associated political instability could adversely affect our business. Like other U.S. companies, our business 
and operating results are subject to uncertainties arising out of economic consequences of current and potential military 
actions or terrorist activities and associated political instability, and the impact of heightened security concerns on domestic 
and international travel and commerce. These uncertainties could also lead to delays or cancellations of customer orders, 
a general decrease in corporate spending or our inability to effectively market and sell our products. Any of these results 
could substantially harm our business and results of operations, causing a decrease in our revenues. 

Item 1B. Unresolved Staff Comments. 

Not applicable. 

Item 2. Properties. 

We own our principal executive, administrative, manufacturing and technical offices which are located in San 
Jose, California. We also own an R&D facility in New Jersey, a design center in Germany and a test facility in Switzerland. 
We  lease  administrative  office  space  in  Singapore  and  Switzerland,  R&D  facilities  in  Canada,  United  Kingdom  and 
Malaysia, in addition to sales offices in various countries around the world to accommodate our sales force. We believe 
that our current facilities are sufficient for our company; however, if headcount increases above capacity we may need to 
lease additional space. 

Item 3. Legal Proceedings. 

Information with respect to this item may be found in Note 13, Legal Proceedings and Contingencies, in our 
Notes to  Consolidated  Financial  Statements  included  later  in  this  Annual  Report  on  Form 10-K,  which  information  is 
incorporated here by reference. 

Item 4. Mine Safety Disclosures. 

Not applicable. 

PART II 

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity 
Securities. 

Our common stock trades on the Nasdaq Global Select Market under the symbol “POWI”. 

As  of  February 2,  2021,  there  were  approximately  43  stockholders  of  record. Because  brokers  and  other 
institutions hold many of our shares on behalf of stockholders, we are unable to estimate the total number of stockholders 
represented by these record holders. 

Issuer Purchases of Equity Securities 

Over the years our board of directors has authorized the use of funds to repurchase shares of our common stock, 
including  $80.0  million  in  October 2018,  with  repurchases  to  be  executed  according  to  pre-defined  price/volume 
guidelines. We did not repurchase any shares of our common stock in the fourth quarter of 2020. As of December 31, 
2020, we had $41.3 million available for future stock repurchases in our repurchase program, which has no expiration 
date. Authorization of future stock-repurchase programs is at the discretion of the board of directors and will depend on 
our financial condition, results of operations, capital requirements and business conditions as well as other factors. 

20 

 
 
 
 
Performance Graph (1) 

The following graph shows the cumulative total return on an investment of $100 in cash on December 31, 2015, 
through December 31, 2020, in our common stock, the Nasdaq Composite Index and the Nasdaq Electronic Components 
Index and assuming that all dividends were reinvested. The stockholder return shown on the graph below is not necessarily 
indicative of future performance, and we do not make or endorse any predictions as to future stockholder returns. 

COMPARISON OF 5 YEAR CUMULATIVE TOTAL RETURN*
Among Power Integrations, Inc., the NASDAQ Composite Index 
and the NASDAQ Electronic Components Index

$400

$350

$300

$250

$200

$150

$100

$50

$0

12/15

12/16

12/17

12/18

12/19

12/20

Power Integrations, Inc.

NASDAQ Composite

NASDAQ Electronic Components

*$100 invested on 12/31/15 in stock or index, including reinvestment of dividends.
Fiscal year ending December 31.

Company/Index 
Power Integrations, Inc.  . . . . . . . . . . . . . . . . . . . .   
Nasdaq Composite. . . . . . . . . . . . . . . . . . . . . . . . .    
Nasdaq Electronic Components . . . . . . . . . . . . . .    

      12/31/15        12/31/16        12/31/17        12/31/18        12/31/19        12/31/20 
 351.57 
 271.64 
 252.83 

 153.94  
 141.13  
 146.21  

 140.87  
 108.87  
 121.48  

 128.81  
 137.12  
 119.92  

 210.80  
 187.44  
 178.71  

 100.00  
 100.00  
 100.00  

(1)  This Section is not “soliciting material,” is not deemed “filed” with the SEC and is not to be incorporated by reference 
in any filing of Power Integrations under the Securities Act of 1933, as amended, or the Securities Exchange Act of 
1934, whether made before or after the date hereof and irrespective of any general incorporation language in any such 
filing. 

21 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Item 6.  Selected Financial Data. 

The following selected consolidated financial data should be read in conjunction with “Management’s Discussion 
and Analysis of Financial Condition and Results of Operations’’ and the consolidated financial statements and the notes 
thereto  included  elsewhere  in  this  Annual  Report  on  Form 10-K  to  fully  understand  factors  that  may  affect  the 
comparability of the information presented below. 

Consolidated Statement of Income Data 
(in thousands, except per share amounts) 
Net revenues  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 488,318   $ 420,669   $  415,955   $ 431,755   $ 389,668 
 57,637       48,874 
Income from operations  . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Provision (benefit) for income taxes . . . . . . . . . . . . . . . . .      
 1,054 
 32,690     
Net income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $  71,176   $ 193,468   $   69,984   $  27,609   $  48,898 

 55,648     
 28,946       (10,220)    

 70,487      217,022     
 4,075     

Year Ended December 31,  
2018 

     2017(3)(4)      

2016(3) 

2019(2) 

2020 

Earnings per share: (1) 

Basic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $
Diluted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $

 1.19   $
 1.17   $

 3.31   $ 
 3.25   $ 

 1.19   $
 1.16   $

 0.47   $
 0.45   $

 0.85 
 0.83 

Shares used in per share calculation: (1) 

Basic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Diluted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Dividends per share (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $

 59,657     
 60,845     
 0.42   $

 58,534     
 59,632     
 0.35   $ 

 58,912     
 60,294     
 0.32   $

 59,348       57,850 
 61,090       59,238 
 0.26 

 0.28   $

Consolidated Balance Sheet Data 
(in thousands) 
 62,134 
Cash and cash equivalents . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $   258,874   $   178,690   $   134,137   $ 
    188,323 
Short-term marketable securities . . . . . . . . . . . . . . . . . . . . . . . .    
    250,457 
Cash, cash equivalents and short-term marketable securities .    
    274,318 
Working capital . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
    554,410 
Total assets  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Long-term liabilities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
 7,380 
Stockholders’ equity  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $   810,411    $   724,546    $   527,072   $   547,682   $  503,084 

 190,318      
 449,192      
 538,706      
 903,339      
 30,402      

 232,398      
 411,088      
 490,863      
 803,896      
 28,874      

 189,236  
 282,891  
 313,483  
 621,074  
 22,341  

 94,451  
 228,588  
 284,066  
 588,697  
 13,259  

     2017(3)(4)       2016(3) 
 93,655   $ 

Year Ended December 31,  
2018 

2019(2) 

2020 

(1)  In  July  2020,  our  board  of  directors  approved  a two-for-one  stock  split  in  the  form  of  a  stock  dividend,  payable 
on August  18,  2020,  to  stockholders  of  record  as  of  the  close  of  business  on August  14,  2020.  Our  stockholders 
received one additional share of common stock for each share of common stock held on August 14, 2020. The share 
and per share information for all periods presented in this Form 10-K have been adjusted for the effect of the stock 
split (Refer to Note 10, Earnings Per Share, in this Form 10-K for details). 

(2)  In October 2019, we entered into a favorable litigation settlement with ON Semiconductor Corporation which resulted 

in a $169.0 million net gain. 

(3)  In 2017, we adopted Accounting Standards Update 2014-09, Revenue from Contracts with Customers, which amended 
the accounting standards for revenue recognition. The standards were applied on a retrospective basis to 2016. 

(4)  In December 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts 

and Jobs Act. 

22 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
    
    
 
     
     
     
     
     
       
       
    
      
      
  
       
       
    
      
      
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
    
    
  
  
  
  
  
  
  
  
  
  
  
 
 
 
Item 7.  Management’s Discussion and Analysis of Financial Condition and Results of Operations. 

The following discussion and analysis of our financial condition and results of our operations should be read in 
conjunction with the consolidated financial statements and the notes to those statements included elsewhere in this Annual 
Report  on  Form 10-K.  This  discussion  contains  forward-looking  statements  that  involve  risks  and  uncertainties.  See 
“Cautionary Note Regarding Forward-Looking Statements” at the beginning of this Form 10-K. Our actual results could 
differ materially from those contained in these forward-looking statements due to a number of factors, including those 
discussed in Part I, Item 1A “Risk Factors” and elsewhere in this report. 

Business Overview 

We design, develop and market analog and mixed-signal integrated circuits (ICs) and other electronic components 
and circuitry used in high-voltage power conversion. Our products are used in power converters that convert electricity 
from a high-voltage source to the type of power required for a specified downstream use. In most cases, this conversion 
entails,  among  other  functions,  converting  alternating  current  (AC)  to  direct  current  (DC)  or  vice  versa,  reducing  or 
increasing the voltage, and regulating the output voltage and/or current according to the customer’s specifications. 

A large percentage of our products are ICs used in AC-DC power supplies, which convert the high-voltage AC 
from a wall outlet to the low-voltage DC required by most electronic devices. Power supplies incorporating our products 
are  used  with  all  manner  of  electronic  products  including  mobile  phones,  computing  and  networking  equipment, 
appliances, electronic utility meters, battery-powered tools, industrial controls, and “home-automation,” or “internet of 
things” applications such as networked thermostats, power strips and security devices. We also supply high-voltage LED 
drivers, which are AC-DC ICs specifically designed for lighting applications that utilize light-emitting diodes, and motor-
driver ICs addressing brushless DC (BLDC) motors used in refrigerators, HVAC systems, ceiling fans and other consumer-
appliance and light commercial applications. 

We  also  offer  high-voltage  gate  drivers—either  standalone  ICs  or  circuit  boards  containing  ICs,  electrical 
isolation components and other circuitry—used to operate high-voltage switches such as insulated-gate bipolar transistors 
(IGBTs) and silicon-carbide (SiC) MOSFETs. These combinations of switches and drivers are used for power conversion 
in high-power applications (i.e., power levels ranging from a few kilowatts up to gigawatts) such as industrial motors, 
solar- and wind-power systems, electric vehicles (EVs) and high-voltage DC transmission systems. 

Our net revenues were $488.3 million, $420.7 million and $416.0 million in 2020, 2019 and 2018, respectively. 
In 2020, revenues increased by $67.6 million due to growth across all end markets reflecting increased adoption of higher-
power chargers for mobile phones and tablets, increased sales for desktop computers and monitors, as well as a broad 
range of  industrial  and  consumer-appliance applications. In 2019, revenues  increased by $4.7 million due  to growth in 
sales  into  the  communications  end-market,  reflecting  increased  adoption  of  faster,  higher-power  chargers  for  mobile 
phones; this trend has resulted in both unit growth and higher average selling prices for our products in this market. Growth 
in  revenues  from  the  communications  end-market  was  largely  offset  by  lower  sales  into  the  consumer  and  industrial 
markets,  primarily  reflecting  macroeconomic,  cyclical  and  trade-related  factors  that  have  affected  the  broader 
semiconductor industry. 

Our top ten customers, including distributors that resell to OEMs and merchant power supply manufacturers, 
accounted  for approximately 62%, 54%  and  56% of net  revenues  in 2020, 2019  and  2018,  respectively.  In 2020,  two 
customers, distributors of our products, accounted for approximately 19% and 11% of net revenues. In 2019 and 2018, 
one  of  these  customers  accounted  for  approximately  11%  and  14%  of  net  revenues.  International  sales  represented 
approximately 98%, 97% and 96% of net revenues in 2020, 2019 and 2018, respectively. 

Because our industry is intensely price-sensitive, our gross margin (gross profit divided by net revenues) is subject 
to change based on the relative pricing of solutions that compete with ours. Variations in product mix, end-market mix 
and customer mix can also cause our gross margin to fluctuate. Also, because we purchase a large percentage of our silicon 
wafers from foundries located in Japan, our gross margin is influenced by fluctuations in the exchange rate between the 
U.S. dollar and the Japanese yen. All else being equal, a 10% change in the value of the U.S. dollar compared to the 
Japanese yen would eventually result in a corresponding change in our gross margin of approximately 1.0%; this sensitivity 
may increase or decrease depending on the percentage of our wafer supply that we purchase from Japanese suppliers. Also, 
although our wafer fabrication and assembly operations are outsourced, as are most of our test operations, a portion of our 
production costs are fixed in nature. As a result, our unit costs and gross profit margin are impacted by the volume of units 
we produce. 

23 

Our gross profit, defined as net revenues less cost of revenues, was $243.6 million or 50% of net revenues in 
2020, compared to $213.4 million or 51% of net revenues in 2019, and $214.8 million or 52% of net revenues in 2018. 
Our gross margin decreased in 2020 due primarily to an unfavorable change in end-market mix with a greater amount of 
revenues coming from lower-margin end markets. Our gross margin decreased in 2019 primarily due to increased wafer 
substrate costs. 

Total operating expenses in 2020 were $173.1 million, compared to a net gain of $3.6 million in 2019 stemming 
from the $169.0 million gain on settlement of our litigation with ON Semiconductor. In 2018, total operating expenses 
were $159.1 million. Apart from the effects of the 2019 legal settlement, the increase in operating expenses in 2020 was 
due primarily to higher stock-based compensation expense related mainly to performance-based awards, along with higher 
salary and related expenses from annual merit increases and the expansion of our workforce. These increases were partially 
offset by lower legal expenses following the conclusion of our litigation with ON Semiconductor as well as lower travel 
expenses, trade event and promotional activities due to COVID-19 pandemic-related restrictions.   

COVID-19 Pandemic 

The COVID-19 pandemic has disrupted everyday life and markets worldwide, and governments around the world 
have imposed restrictions aimed at controlling the spread of the virus, including shelter-in-place orders, travel restrictions, 
business shutdowns and border closures. Beginning March 16, 2020 our San Jose headquarters location was subject to a 
shelter-in-place order, under which most of our employees were required to work from home; other locations around the 
world have also been subject to such restrictions. We will begin a phased reopening of our San Jose headquarters when 
these restrictions are lifted. Some of our employees in other locations around the world have returned to the office under 
a phased reopening plan. We have implemented a variety of measures to protect the health and safety of our employees, 
including the provision of masks, gloves and sanitizers, social-distancing rules, and regular deep cleaning of our facilities. 

While we have been able to conduct our day-to-day operations effectively in spite of the restrictions caused by 
the pandemic, the pandemic has caused disruptions in our supply chain. While the supply of wafers from our foundry 
partners has not been interrupted, government-mandated closures in China, Malaysia, Sri Lanka and the Philippines in the 
early stages of the pandemic caused temporary shutdowns at our assembly and test sub-contractors in those countries. All 
of the affected sub-contractors have now resumed operations. While these disruptions resulted in delayed shipments to 
some customers, our results were not materially affected due to a variety of mitigation measures including higher-than-
normal inventories of wafers and finished goods, safety stocks of certain key inputs, and multiple sources for components 
for most of our products. 

Despite the economic downturn stemming from the pandemic, demand for goods incorporating our products is 
strong. While the future trajectory of demand is highly uncertain, we believe our business is fundamentally sound with 
strong,  long-term  growth  prospects.  We  have  not  reduced  headcount  and  intend  to  continue  investing  in  research  and 
development and other functions necessary to support our future growth. We also intend to continue our cash dividend 
and  stock  repurchase  programs;  however,  if  the  economy  deteriorates  more  than  we  expect  or  our  business  outlook 
changes, our board of directors may choose to suspend or alter these programs at its discretion. For additional discussion 
regarding COVID-19 business risks refer to Part I, Item 1A “Risk Factors” in this Annual Report on Form 10-K. 

Critical Accounting Policies and Estimates 

The preparation of financial statements and related disclosures in conformity with accounting principles generally 
accepted in the United States of America, or U.S. GAAP, requires management to make estimates and assumptions that 
affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the 
financial statements and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, 
we  evaluate  our  estimates,  including  those  listed  below.  We  base  our  estimates  on  historical  facts  and  various  other 
assumptions that we believe to be reasonable at the time the estimates are made. Actual results could differ from those 
estimates. 

Our critical accounting policies are as follows: 
• 
• 

revenue recognition; and 

income taxes. 

24 

 
Our critical accounting policies are important to the portrayal of our financial condition and results of operations, 
and require us to make judgments and estimates about matters that are inherently uncertain. A brief description of these 
critical  accounting  policies  is  set  forth  below.  For  more  information  regarding  our  accounting  policies,  see  Note 2, 
Summary  of  Significant  Accounting  Policies  and  Recent  Accounting  Pronouncements,  in  our  Notes to  Consolidated 
Financial Statements in this Annual Report on Form 10-K. 

Revenue recognition 

Product  revenues  consist  of  sales  to  original  equipment  manufacturers,  or  OEMs,  merchant  power  supply 
manufacturers and distributors. Approximately 75% of our net product sales were made to distributors in 2020. We apply 
the  provisions  of  Accounting  Standards  Codification  (ASC)  606-10,  Revenue  from  Contracts  with  Customers,  and  all 
related  appropriate  guidance.  We  recognize  revenue  under  the  core  principle  to  depict  the  transfer  of  control  to  our 
customers in an amount reflecting the consideration we expect to be entitled. In order to achieve that core principle, we 
apply the following five-step approach: (1) identify the contract with a customer, (2) identify the performance obligations 
in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the 
contract, and (5) recognize revenue when a performance obligation is satisfied. 

Product  revenues  consist  of  sales  to  original  equipment  manufacturers,  or  OEMs,  merchant  power  supply 
manufacturers and distributors. We consider customer purchase orders, which in some cases are governed by master sales 
agreements, to be the contracts with a customer. In situations where sales are to a distributor, we have concluded that our 
contracts are with the distributor as we hold contracts bearing enforceable rights and obligations with only the distributor. 
As part of our consideration of the contract, we evaluate certain factors including the customer’s ability to pay (or credit 
risk).  For  each  contract,  we  consider  the  promise  to  transfer  products,  each  of  which  is  distinct,  to  be  the  identified 
performance  obligations.  In  determining  the  transaction  price  we  evaluate  whether  the  price  is  subject  to  refund  or 
adjustment to determine the net consideration to which we expect to be entitled. As our standard payment terms are less 
than one year, we elected the practical expedient under ASC 606-10-32-18 to not assess whether a contract has a significant 
financing component. We allocate the transaction price to each distinct product based on their relative standalone selling 
price. We consider the product price as specified on the purchase order the standalone selling price as it is an observable 
input which depicts the price as if sold to a similar customer in similar circumstances. We recognize revenue when control 
of the product is transferred to the customer (i.e., when our performance obligation is satisfied), which typically occurs at 
shipment. Further, in determining whether control has transferred, we consider if there is a present right to payment and 
legal title, along with risks and rewards of ownership having transferred to the customer. 

Frequently, we receive orders for products to be delivered over multiple dates that may extend across several 
reporting periods. We invoice for each delivery upon shipment and recognize revenue for each distinct product delivered, 
assuming transfer of control has occurred. As scheduled delivery dates are within one year, under the optional exemption 
provided by ASC 606-10-50-14 revenues allocated to future shipments of partially completed contracts are not disclosed. 
We  have  also  elected  the  practical  expedient  under  ASC  340-40-25-4  to  expense  commissions  when  incurred  as  the 
amortization period of the commission asset we would have otherwise recognized is less than one year. 

Sales to international customers that are shipped from our facility outside of the United States are pursuant to EX 
Works, or EXW, shipping terms, meaning that control of the product transfers to the customer upon shipment from our 
foreign warehouse. Sales to international customers that we ship from our facility in California are pursuant to Delivered 
at Frontier, or DAF, shipping terms. As such, control of the product passes to the customer when the shipment reaches the 
destination country and we recognize revenue upon the arrival of the product in that country. Shipments to customers in 
the Americas are pursuant to Free on Board, or FOB, point of origin shipping terms meaning that we pass control to the 
customer upon shipment. 

Sales to most distributors are made under terms allowing certain price adjustments and limited rights of return 
(known as “stock rotation”) of our products held in their inventory or upon sale to their end customers. We recognize 
revenue from sales to distributors upon the transfer of control to the distributor. Frequently, distributors need to sell at a 
price lower than the standard distribution price in order to win business. At the time the distributor invoices its customer 
or soon thereafter, the distributor submits a “ship and debit” price adjustment claim to us to adjust the distributor’s cost 
from the standard price to the pre-approved lower price. After we verify that the claim was pre-approved, we issue a credit 
memo to the distributor for the ship and debit claim. In determining the transaction price, we consider ship and debit price 
adjustments to be variable consideration. Such price adjustments are estimated using the expected value method based on 
an analysis of actual ship and debit claims, at the distributor and product level, over a period of time considered adequate 

25 

to account for current pricing and business trends. Historically, actual price adjustments for ship and debit claims relative 
to those estimated and included when determining the transaction price have not materially differed. To the extent future 
ship and debit claims significantly exceed amounts estimated, there could be a material impact on our revenues and results 
of operations. Stock rotation rights grant the distributor the ability to return certain specified amounts of inventory. Stock 
rotation  adjustments  are  an  additional  form  of  variable  consideration  and  are  also  estimated  using  the  expected  value 
method based on historical return rates. Historically, these distributor stock rotation adjustments have not been material. 

Sales to certain distributors are made under terms that do not include rights of return or price concessions after 
the product is shipped to the distributor. Accordingly, upon application of steps one through five above, product revenue 
is recognized upon shipment and transfer of control. 

We  generally  provide  an  assurance  warranty  that  our  products  will  substantially  conform  to  the  published 
specifications for twelve months from the date of shipment. Our liability is limited to either a credit equal to the purchase 
price or replacement of the defective part. Returns under warranty have historically been immaterial. As such, we do not 
record a specific warranty reserve or consider activities related to such warranty, if any, to be a separate performance 
obligation. 

Income taxes 

We account for income taxes under the provisions of ASC 740, Income Taxes. Under the provisions of ASC 740, 
deferred tax assets and liabilities are recognized based on the differences between the financial statement carrying amounts 
of existing assets and liabilities and their respective tax bases, utilizing the tax rates that are expected to apply to taxable 
income in the years in which those temporary differences are expected to be recovered or settled. We recognize valuation 
allowances to reduce any deferred tax assets to the amount that we estimate will more likely than not be realized based on 
available  evidence  and  management’s  judgment.  In  the  event  that  we  determine,  based  on  available  evidence  and 
management judgment, that all or part of the net deferred tax assets will not be realized in the future, we would record a 
valuation  allowance  in  the  period  the  determination  is  made.  In  addition,  the  calculation  of  tax  liabilities  involves 
significant judgment in estimating the impact of uncertainties in the application of complex tax laws. Resolution of these 
uncertainties in a manner inconsistent with our expectations could have a material impact on our results of operations and 
financial position. 

As of December 31, 2020, we continue to maintain a valuation allowance on our California, New Jersey and 
Canada deferred tax assets as we believe that it is not more likely than not that the deferred tax assets will be fully realized. 

Results of Operations 

The following table sets forth statement of income data as a percentage of net revenues for the periods indicated: 

Year Ended December 31,  
2019 

2020 

Net revenues  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Cost of revenues  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Gross profit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  

 100.0 %    
 50.1   
 49.9   

 100.0 %   
 49.3   
 50.7   

Operating expenses: 
Research and development . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Sales and marketing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
General and administrative  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Litigation settlement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Total operating expenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Income from operations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Other income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Income before income taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Provision (benefit) for income taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Net income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  

 16.7   
 11.2   
 7.6   
 —   
 35.4   
 14.4   
 1.0   
 15.4   
 0.8   
 14.6 %    

 17.5   
 12.9   
 8.9   
 (40.2)  
 (0.9)  
 51.6   
 1.3   
 52.9   
 6.9   
 46.0 %   

2018 

 100.0 % 
 48.4  
 51.6  

 17.0  
 12.8  
 8.4  
 —  
 38.2  
 13.4  
 1.0  
 14.4  
 (2.4) 
 16.8 % 

26 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Comparison of Years Ended December 31, 2020, 2019 and 2018 

Net  revenues.  Net  revenues  consist  of  revenues  from  product  sales,  which  are  calculated  net  of  returns  and 
allowances. In 2020 revenues increased by $67.6 million compared to 2019 due to growth across all end markets reflecting 
increased adoption of higher-power chargers for mobile phones and tablets, increased sales for desktop computers and 
monitors, as well as a broad range of consumer appliance and industrial applications. In 2019 revenues increased by $4.7 
million compared to 2018 as growth in the communications end-market more than offset a broad-based decline in demand 
across the consumer and industrial end markets.  

Our approximate net revenue mix by end-markets served in 2020, 2019 and 2018 is as follows: 

End Market 
Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Consumer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Industrial  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

2020 

2019 

2018 

 30 %  
 7 %  
 33 %  
 30 %  

 26 %  
 5 %  
 35 %  
 34 %  

 20 % 
 5 % 
 38 % 
 37 % 

Sales to customers outside of the United States were $477.3 million in 2020, compared to $410.0 million in 2019 
and $400.6 million in 2018, representing approximately 98%, 97% and 96% of net revenues in 2020, 2019 and 2018, 
respectively. Although power supplies using our products are designed and distributed worldwide, most of these power 
supplies are manufactured by our customers in Asia. As a result, sales to this region accounted for approximately 81% of 
our net revenues in 2020, and 77% of our net revenues in each of 2019 and 2018. We expect international sales to continue 
to account for a large portion of our net revenues for the foreseeable future. 

Sales to distributors accounted for 75%, 72% and 75% of our net revenues in 2020, 2019 and 2018, respectively, 
with  direct  sales  to  OEMs  and  merchant  power  supply  manufacturers  accounting  for  the  remainder  in  each  of  the 
corresponding years.  

The following customers represented 10% or more of our net revenues for the respective years: 

Customer 
Avnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Honestar Technologies Co., Ltd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
________________________ 

*Total customer revenue was less than 10% of net revenues. 
No other customers accounted for 10% or more of net revenues during these years. 

2020 

 19 %   
 11 %   

2019 

2018 

 11 %   
*  

 14 % 
*  

Gross profit. Gross profit is net revenues less cost of revenues. Our cost of revenues consists primarily of the purchase of 
wafers from our contracted foundries, the assembly, packaging and testing of our products by sub-contractors, product 
testing performed in our own facility, overhead associated with the management of our supply chain and the amortization 
of acquired intangible assets. Gross margin is gross profit divided by net revenues. The following table compares gross 
profit and gross margin for the years ended December 31, 2020, 2019 and 2018: 

(dollars in millions) 
Gross profit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   $  243.6     
 49.9 %  
Gross margin . . . . . . . . . . . . . . . . . . . . . . . . . . . .     

2020 

 51.6 % 
Our gross margin decreased in 2020 as compared to 2019 primarily due to an unfavorable change in end-market 
mix with a greater amount of revenues coming from lower-margin end markets. Our gross margin decreased in 2019 as 
compared to 2018 primarily due to increased wafer substrate costs.  

 50.7 %    

Change 
 14.1 %    $ 

2019 
 213.4   

Change 
 (0.7)%     $ 

2018 
 214.8  

Research and development expenses. Research and development (R&D) expenses consist primarily of employee-
related  expenses  including  salaries  and  stock-based  compensation,  as  well  as  expensed  material  and  facility  costs 
associated  with  the  development  of  new  processes  and  products.  We  also  record  R&D  expenses  for  prototype  wafers 
related to new products until the products are released to production. The following table compares R&D expenses for 
the years ended December 31, 2020, 2019 and 2018: 

(dollars in millions) 
R&D expenses . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Percentage of net revenues . . . . . . . . . . . . . . . . .      

2020 
 81.7     
 16.7 %  

Change 
 11.2 %     $ 

2019 
 73.5   
 17.5 %    

Change 

 4.1 %    $ 

2018 
 70.6  
 17.0 %

27 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
  
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
    
 
  
     
 
  
R&D expenses increased in 2020 compared to 2019 due to higher salary and related expenses driven by expansion 
of headcount and annual merit increases, increased equipment-related expenses in support of product development as well 
as higher stock-based compensation expense primarily related to performance-based awards. R&D expenses increased 
in 2019 compared to 2018 due to higher salary and related expenses driven by increased headcount as well as increased 
equipment-related expenses. 

Sales  and  marketing  expenses.  Sales  and  marketing  (S&M)  expenses  consist  primarily  of  employee-related 
expenses,  including  salaries  and  stock-based  compensation,  and  commissions  to  sales  representatives,  as  well  as 
amortization of acquired intangible assets and facilities expenses, including expenses associated with our regional sales 
and support offices. The following table compares sales and marketing expenses for the years ended December 31, 2020, 
2019 and 2018: 

(dollars in millions) 
Sales and marketing expenses  . . . . . . . . . . . . . .    $ 
Percentage of net revenues . . . . . . . . . . . . . . . . .      

2020 
 54.5   
 11.2 %   

Change 

 0.4 %    $

2019 
 54.3   
 12.9 %   

Change 

 2.3 %    $

2018 
 53.1  
 12.8 %

S&M expenses increased in 2020 compared to 2019 due to higher salary and related expenses from the expansion 
of headcount and higher stock-based compensation expense primarily related to performance-based awards. These factors 
were partially offset by lower travel expenses, trade event and promotional activities resulting from restrictions associated 
with the COVID-19 pandemic, as well as lower amortization of intangibles. S&M expenses increased in 2019 as compared 
to 2018 due primarily to expansion of our sales force, resulting in higher salary and related expenses, partially offset by 
lower amortization of intangibles. 

General  and  administrative  expenses.  General  and  administrative  (G&A)  expenses  consist  primarily  of 
employee-related expenses, including salaries and stock-based compensation expenses for administration, finance, human 
resources and general management, as well as consulting, professional services, legal and auditing expenses. The table 
below compares G&A expenses for the years ended December 31, 2020, 2019 and 2018: 

(dollars in millions) 
G&A expenses . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Percentage of net revenues . . . . . . . . . . . . . . . . .      

2020 
 36.9      
 7.6 %  

Change 
 (1.9)%    $ 

2019 
 37.6   
 8.9 %   

Change 

 5.9 %     $ 

2018 
 35.5  
 8.4 %

G&A expenses decreased in 2020 due to lower patent-litigation expenses partially offset by higher stock-based 
compensation expense primarily related to performance-based awards. G&A expenses increased in 2019 as a result of 
increased expenses related to patent litigation and higher salary and related expenses due to expansion of headcount.  

Litigation settlement. Litigation settlement in fiscal 2019 represents a $169.0 million gain net of direct legal fees 
due  to  a  favorable  legal  settlement  with  ON  Semiconductor  Corporation,  pursuant  to  which  all  outstanding  legal  and 
administrative disputes were dismissed, withdrawn, and/or terminated.  

Other  income.  Other  income  consists  primarily  of  interest  income  earned  on  cash  and  cash  equivalents, 
marketable  securities  and  other  investments,  and  the  impact  of  foreign  exchange  gains  or  losses.  The  following  table 
compares other income for the years ended December 31, 2020, 2019 and 2018: 

(dollars in millions) 
Other income . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Percentage of net revenues . . . . . . . . . . . . . . . . .      

2020 
 4.8  
 1.0 %   

Change 
 (11.8)%     $

2019 
 5.4   
 1.3 %    

Change 
 32.0 %     $

2018 

 4.1  
 1.0 %

Other income decreased in 2020 due primarily to lower interest income, reflecting lower yields earned on our 
cash and investments despite higher cash and investment balances. Other income increased in 2019 due primarily to an 
increase in interest income reflecting an increase in our cash and investments along with higher yields earned on those 
balances. 

28 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
    
 
  
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
    
 
  
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
    
 
  
    
 
  
 
Provision (benefit) for income taxes. Provision (benefit) for income taxes represents federal, state and foreign 
taxes. The following table compares the provision (benefit) for income taxes for the years ended December 31, 2020, 2019 
and 2018: 

(dollars in millions) 
Provision (benefit) for income taxes . . . . . . . . .    $
Percentage of net revenues . . . . . . . . . . . . . . . . .      
Effective tax rate . . . . . . . . . . . . . . . . . . . . . . . . .      

2020 
 4.1  
 0.8 %    
 5.4 %   

Change 
 (85.9)%     $

2019 
 28.9  
 6.9 %    
 13.0 %    

Change 
 383.2 %     $  (10.2) 

2018 

 (2.4)%
 (17.1)%

In 2020, 2019 and 2018, the effective tax rate was lower than the statutory U.S. federal income-tax rates of 21% 
due to the geographic distribution of our world-wide earnings in lower tax jurisdictions, the impact of federal research tax 
credits and the recognition of excess tax benefits related to share-based compensation. These benefits were partially offset 
by U.S. tax on foreign income, known as global intangible low-taxed income. Additionally, in 2018 the effective tax rate 
was favorably impacted by revisions to our provisional estimate for the enactment of the U.S. Tax Cuts and Jobs Act (Tax 
Act).  The primary jurisdiction from which our foreign earnings are derived is the Cayman Islands, which is a non-taxing 
jurisdiction. Income earned in other foreign jurisdictions was not material. We have not been granted any incentivized tax 
rates  and  do not  operate under  any  tax holidays  in  any  jurisdiction.  For additional  details,  refer  to  Note 11, Provision 
(Benefit)  for  Income  Taxes,  in  our  Notes to  Consolidated  Financial  Statements  included  in  this  Annual  Report  on 
Form 10-K. 

Liquidity and Capital Resources 

We  had  approximately  $449.2  million  in  cash,  cash  equivalents  and  short-term  marketable  securities  at 
December 31, 2020 compared to $411.1 million at December 31, 2019, and $228.6 million at December 31, 2018. As of 
December 31,  2020,  2019  and  2018,  we  had  working  capital,  defined  as  current  assets  less  current  liabilities,  of 
approximately $538.7 million, $490.9 million and $284.1 million, respectively. 

We have a credit agreement with a bank (the "Credit Agreement") that provides us with a $75.0 million revolving 
line of credit to use for general corporate purposes with a $20.0 million sub-limit for the issuance of standby and trade 
letters of credit. Our ability to borrow under the revolving line of credit is conditioned upon our compliance with specified 
covenants, including reporting and financial covenants, primarily a minimum liquidity measure and a debt to earnings 
ratio, with which we are currently in compliance. The Credit Agreement terminates on April 30, 2022; all advances under 
the revolving line of credit will become due on such date, or earlier in the event of a default. As of December 31, 2020, 
and 2019, we had no advances outstanding under the Credit Agreement. 

Our operating activities generated cash of $125.6 million, $224.5 million, and $84.0 million in the years ended 
December 31, 2020, 2019 and 2018, respectively. We generate cash primarily from operating activities in the ordinary 
course  of  business.  In  addition,  in  2019  our  cash  generated  from  operating  activities  was  favorably  impacted  by  the 
settlement of our patent litigation with ON Semiconductor Corporation. 

Cash Provided by Operating Activities 

In 2020, our net income was $71.2 million, which reflected non-cash charges of $30.9 million of stock-based 
compensation expenses, $23.7 million of depreciation and $4.4 million of intangibles amortization. Sources of cash also 
included a $9.1 million decrease in prepaid expenses and other assets, primarily driven by taxes refunded, a $5.7 million 
increase in accounts payable (excluding payables related to property and equipment) and a $4.1 million increase in taxes 
payable and accrued liabilities, in each case due to the timing of payments. These sources of cash were partially offset by 
an $11.3 million increase in accounts receivable due to increased shipments and the timing of collections, a $12.5 million 
increase in inventories, reflecting impact of a market slowdown during the first half of the year and higher inventory levels 
to support anticipated future demand. 

In 2019, our net income was $193.5 million, which included a $169.0 million gain, net of direct legal fees, from 
a favorable litigation settlement, $23.3 million of stock-based compensation expenses, $19.2 million of depreciation and 
$5.2  million  of  intangibles  amortization.  Sources  of  cash  also  included  a  $10.6  million  increase  in  taxes  payable  and 
accrued liabilities due primarily to increased taxes payable as result of favorable litigation settlement. These sources of 
cash were partially offset by a $13.3 million increase in accounts receivable due to increased shipments and the timing of 
collections, a $9.5 million increase in inventories in anticipation of future demand, and a $6.6 million decrease in accounts 
payable due to the timing of payments. 

29 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
   
 
  
   
 
  
   
 
  
   
 
  
 
In 2018, our net income was $70.0 million, which included stock-based compensation expenses, depreciation and 
intangibles amortization of $21.6 million, $18.9 million, and $5.3 million, respectively. Sources of cash also included 
a $5.8 million decrease in accounts receivable due to decreased shipments and the timing of collections. These sources of 
cash were partially offset by a $23.8 million increase in inventories, partially reflecting lower-than-normal inventory levels 
at the beginning of the year, but also driven by lower-than-expected sales, particularly in the latter half of the year, and 
a $9.9 million decrease in taxes payable and accrued liabilities due primarily to a decrease in taxes payable related to the 
enactment of the Tax Act. 

Cash Provided by (Used in) Investing Activities 

Our  investing  activities  in  the year  ended  December 31,  2020  resulted  in  a  $28.3  million  net  use  of  cash, 
consisting primarily of $41.7 million from purchases of marketable securities, net of sales and maturities, and $70.6 million 
for purchases of property and equipment, primarily machinery and equipment for use in the manufacture of our products 
and a building for our design center in Germany. 

Our  investing  activities  in  the year  ended  December 31,  2019  resulted  in  a  $162.0  million  net  use  of  cash, 
consisting  primarily  of  $136.9  million  from  purchases  of  marketable  securities,  net  of  sales  and  maturities,  and  $24.1 
million for purchases of property and equipment, primarily machinery and equipment for use in the manufacture of our 
products. 

Our investing activities provided $69.1 million of cash in the year ended December 31, 2018, consisting primarily 
of $94.7 million from sales and maturities of marketable securities, net of purchases, partially offset by $24.7 million for 
purchases of property and equipment, primarily machinery and equipment for use in the manufacture of our products. 

Cash Used in Financing Activities 

Our financing activities  in  the year ended December 31, 2020, resulted in  a  net use of  $17.2 million  of  cash. 
Financing activities consisted primarily of $25.1 million for the payment of dividends to stockholders and $2.6 million for 
the repurchase of our common stock, partially offset by proceeds of $10.5 million from the issuance of common stock, 
including the exercise of employee stock options and the issuance of shares through our employee stock purchase plan. 

Our financing activities  in  the year ended December 31, 2019, resulted in  a  net use of  $17.9 million  of  cash. 
Financing activities consisted primarily of $20.5 million for the payment of dividends to stockholders and $7.3 million for 
the repurchase of our common stock, partially offset by proceeds of $9.9 million from the issuance of common stock, 
including the exercise of employee stock options and the issuance of shares through our employee stock purchase plan. 

Our financing activities in the year ended December 31, 2018, resulted in a net use of $112.6 million of cash. 
Financing activities consisted primarily of $103.2 million for the repurchase of our common stock and $18.8 million for 
the payment of dividends to stockholders, partially offset by proceeds of $9.4 million from the issuance of common stock, 
including the exercise of employee stock options and the issuance of shares through our employee stock purchase plan. 

Dividends 

In January 2018, our board of directors declared four quarterly cash dividends in the amount of $0.08 per share 
to  be  paid  to  stockholders  of  record  at  the  end  of  each  quarter  in  2018.  In  January  2019,  our  board  of  directors 
declared four quarterly cash dividends of $0.085 per share to be paid to stockholders of record at the end of each quarter 
in  2019.  In  October  2019,  our  board  of  directors  raised  the  cash  dividends  per  share  with  the  declaration  of five cash 
dividends, consisting of (a) a dividend of $0.01 per share to be paid to stockholders of record at the end of the fourth 
quarter in 2019, that was in addition to the dividend of $0.085 per share to be paid to stockholders of record at the end of 
the fourth quarter in 2019 previously declared by the board in January 2019, and (b) a dividend of $0.095 per share to be 
paid to stockholders of record at the end of each quarter in 2020. In April 2020, our board of directors raised the cash 
dividends  with  the  declaration  of three cash  dividends  of  $0.105 per  share  (in  lieu  of  the  $0.095 per  share  previously 
announced in October 2019) to be paid to stockholders of record at the end of each of the second, third and fourth quarter 
in 2020. In July 2020, our board of directors raised the cash dividends further with the declaration of two cash dividends 
of $0.11 per share (in lieu of the $0.105 per share announced in April 2020) to be paid to stockholders of record at the end 
of each of the third and fourth quarter in 2020. In January 2021, our board of directors raised the quarterly cash dividend 
by an additional $0.02 per share with the declaration of four cash dividends of $0.13 per share to be paid to stockholders 
of record at the end of each quarter in 2021. The declaration of any future cash dividend is at the discretion of the board 
of directors and will depend on our financial condition, results of operations, capital requirements, business conditions and 

30 

other factors, as well as a determination that cash dividends are in the best interest of our stockholders. The dividends per 
share presented above reflect the 2-for-1 stock split implemented as a stock dividend in August 2020. 

Stock Repurchases 

Over the years our board of directors has authorized the use of funds to repurchase shares of our common stock, 
including $80.0 million in October 2018 with repurchases to be executed according to pre-defined price/volume guidelines. 
In 2018, we  purchased  3,144,000  shares for  approximately  $103.2  million.  In 2019, we  purchased 242,000  shares  for 
approximately $7.3 million. In 2020, we purchased 63,000 shares for approximately $2.6 million. As of December 31, 
2020, $41.3 million was available for future stock repurchases, which has no expiration date. Authorization of future stock 
repurchase programs is at the discretion of the board of directors and will depend on our financial condition, results of 
operations, capital requirements and business conditions as well as other factors. 

As  of  December 31,  2020,  we  had  a  contractual  obligation  related  to  income  tax,  consisting  primarily  of 
unrecognized tax benefits of approximately $21.1 million. The tax obligation was classified as long-term income taxes 
payable or recorded as contra deferred tax assets in our consolidated balance sheet. 

Other Information 

Our cash, cash equivalents and investment balances may change in future periods due to changes in our planned 
cash outlays, including changes in incremental costs such as direct and integration costs related to future acquisitions. The 
Tax Act signed into law on December 22, 2017 subjects U.S. companies to a one-time transition tax on total post-1986 
earnings and profits of their foreign subsidiaries and generally allows companies to repatriate accumulated foreign earnings 
without incurring additional U.S. federal taxes beginning after December 31, 2017. Accordingly, as of December 31, 2020, 
our worldwide cash and marketable securities are available to fund capital allocation needs, including capital and internal 
investments, acquisitions, stock repurchases and/or dividends without incurring significant U.S. federal income taxes. 

If our operating results deteriorate in future periods, either as a result of a decrease in customer demand or pricing 
pressures from our customers or our competitors, or for other reasons, our ability to generate positive cash flow from 
operations may be jeopardized. In that case, we may be forced to use our cash, cash equivalents and short-term investments, 
use  our  current  financing  or  seek  additional  financing  from  third  parties  to  fund  our  operations.  We  believe  that  cash 
generated from operations, together with existing sources of liquidity, will satisfy our projected working capital and other 
cash requirements for at least the next 12 months. 

Off-Balance-Sheet Arrangements 

As of December 31, 2020 and 2019, we did not have any off-balance-sheet arrangements or relationships with 
unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose 
entities, which are typically established for the purpose of facilitating off-balance-sheet arrangements or other contractually 
narrow or limited purposes. 

Contractual Obligations 

As of December 31, 2020, we had the following contractual obligations: 

Payments Due by Period 

  Less than 1 

(in thousands) 
Operating lease obligations(1) . . . . . . . . . . . . . . . . . .    $ 
Purchase obligations(2)  . . . . . . . . . . . . . . . . . . . . . . .    $ 
________________________ 
(1)  Operating lease obligations represent undiscounted non-cancelable remaining lease payments. 
(2)  Purchase obligations represent commitments to our suppliers and other parties for the purchases of goods and services, 
which  primarily  consist  of  wafer  and  other  inventory  purchases,  assembly  and  other  manufacturing  services,  and 
purchases of property and equipment. 

      1 - 3 Years        4 - 5 Years       Over 5 Years 
 — 
 — 

Year 
 2,909   $ 
 60,084  

Total 
 8,220   $ 
 60,084   $ 

 4,478   $ 
 —  

 833  
 —  

In addition to our contractual obligations noted above we have a contractual obligation related to income tax as 
of December 31, 2020, which primarily comprises unrecognized tax benefits of approximately $21.1 million, and was 
classified  as  contra  deferred  tax  assets  or  long-term  income  taxes  payable  in  our  consolidated  balance  sheet.  As  of 

31 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
     
  
 
 
 
December 31, 2020 we also had approximately $4.5 million classified as long-term income taxes payable related to the 
estimated one-time transition tax from the enactment of the Tax Act which will be payable in five annual installments. 

Recently Issued Accounting Pronouncements 

For recently issued accounting announcements, see “Recently Issued Accounting Pronouncements” in Note 2, 
Significant  Accounting  Policies  and  Recent  Accounting  Pronouncements,  in  our  Notes to  Consolidated  Financial 
Statements included in this Annual Report on Form 10-K. 

Item 7A. Quantitative and Qualitative Disclosures About Market Risk. 

Interest Rate Risk. Our exposure to market risk for changes in interest rates relates primarily to our investment 
portfolio. We consider cash invested in highly liquid financial instruments with a remaining maturity of three months or 
less at the date of purchase to be cash equivalents. Investments in highly liquid financial instruments with maturities greater 
than three months are classified as short-term investments. We generally hold securities until maturity; however, they may 
be sold under certain circumstances, including, but not limited to, when necessary for the funding of acquisitions and other 
strategic investments. As a result of this policy, we classify our investment portfolio as available-for-sale. We invest in 
high-credit quality issuers and, by policy, limit the amount of credit exposure to any one issuer. As stated in our policy, 
we seek to ensure the safety and preservation of our invested principal funds by limiting default risk, market risk and 
reinvestment  risk.  We  mitigate  default  risk  by  investing  in  safe  and  high-credit  quality  securities  and  by  constantly 
positioning our portfolio to respond appropriately to a significant reduction in a credit rating of any investment issuer, 
guarantor  or  depository.  The  portfolio  includes  only  marketable  securities  with  active  secondary  or  resale  markets  to 
facilitate  portfolio  liquidity.  At  December 31,  2020  and  2019,  we  held  primarily  cash  equivalents  and  short-term 
investments with fixed interest rates. We do not hold any instruments for trading purposes. 

Our investment securities are subject to market interest rate risk and will vary in value as market interest rates 
fluctuate.  To  minimize  market  risk,  we  invest  in  high-credit  quality  issuers  and,  by  policy,  limit  the  amount  of  credit 
exposure to any one issuer, and therefore if market interest rates were to increase or decrease by 10% from interest rates 
as of December 31, 2020, or December 31, 2019, the increase or decrease in the fair market value of our portfolio on these 
dates would not have been material. We monitor our investments for impairment on a periodic basis. Refer to Note 5, 
Marketable  Securities,  in  our  Notes to  Consolidated  Financial  Statements  in  this  Annual  Report  on  Form 10-K,  for  a 
tabular presentation of our available-for-sale investments and the expected maturity dates. 

Foreign Currency Exchange Risk. As of December 31, 2020, our primary transactional currency was the U.S. 
dollar; in addition, we hold cash in Swiss francs and euros to fund the operation of our Swiss subsidiary. Cash balances 
held in foreign countries are subject to local banking laws and may bear higher or lower risk than cash deposited in the 
United States. The following represents the potential impact on our pretax income from a change in the value of the U.S. 
dollar compared to the Swiss franc and euro as of December 31, 2020. This sensitivity analysis applies a change in the 
U.S. dollar value of 5% and 10%. 

(in thousands of USD) 
Swiss franc and euro foreign exchange impact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 

December 31, 2020 

5% 

10% 

 121   $ 

 242 

The foreign exchange rate fluctuation between the U.S. dollar versus the Swiss franc and euro is recorded in other 

income in our consolidated statements of income. 

We  have  sales  offices  in  various  other  foreign  countries  in  which  our  expenses  are  denominated  in  the  local 
currency, primary Asia and Western Europe. From time to time we may enter into foreign currency hedging contracts to 
hedge certain foreign currency transactions. As of December 31, 2020, and December 31, 2019, we did not have an open 
foreign currency hedge program utilizing foreign currency forward exchange contracts. 

With two of our major suppliers, Seiko Epson Corporation (Epson) and ROHM Lapis Semiconductor Co., Ltd. 
(Lapis) we have wafer supply agreements based in U.S. dollars; however, our agreements with Epson and Lapis also allow 
for mutual sharing of the impact of the exchange rate fluctuation between Japanese yen and the U.S. dollar. Each year, our 
management and these suppliers review and negotiate pricing; the negotiated pricing is denominated in U.S. dollars but is 
subject to contractual exchange rate provisions. The fluctuation in the exchange rate is shared equally between us and each 
of these suppliers. 

32 

 
 
 
 
 
 
 
 
 
 
     
     
 
Nevertheless,  as  a  result  of  our  above-mentioned  supplier  agreements,  our  gross  margin  is  influenced  by 
fluctuations in the exchange rate between the U.S. dollar and the Japanese yen. All else being equal, a 10% change in the 
value of the U.S. dollar compared to the Japanese yen would eventually result in a corresponding change in our gross 
margin of approximately 1.0%; this sensitivity may increase or decrease depending on the percentage of our wafer supply 
that  we  purchase  from  some  of  our  Japanese  suppliers  and  could  subject  our  gross  profit  and  operating  results  to  the 
potential for material fluctuations. 

33 

 
 
Item 8. Financial Statements and Supplementary Data. 

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM 

To the Stockholders and the Board of Directors of Power Integrations, Inc. 

Opinion on the Financial Statements 

We  have  audited  the  accompanying  consolidated  balance  sheets  of  Power  Integrations,  Inc.  and  subsidiaries  (the 
"Company") as of December 31, 2020 and 2019, the related consolidated statements of income, comprehensive income, 
stockholders' equity, and cash flows for each of the three years in the period ended December 31, 2020, and the related 
notes (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all 
material respects, the financial position of the Company as of December 31, 2020 and 2019, and the results of its operations 
and its cash flows for each of the three years in the period ended December 31, 2020, in conformity with the accounting 
principles generally accepted in the United States of America. 

We  have  also  audited,  in  accordance  with  the  standards  of  the  Public  Company  Accounting  Oversight  Board  (United 
States)  (PCAOB),  the  Company's  internal  control over  financial  reporting  as  of December 31,  2020, based  on  criteria 
established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of 
the Treadway Commission and our report dated February 5, 2021 expressed an unqualified opinion on the Company's 
internal control over financial reporting. 

Change in Accounting Principle 

As discussed in Note 12 to the financial statements, effective January 1, 2019, the Company adopted Accounting Standards 
Update (ASU) 2016-02, Leases (Topic 842), using the optional transition method. 

Basis for Opinion 

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion 
on the Company's financial statements based on our audits. We are a public accounting firm registered with the PCAOB 
and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and 
the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. 

We  conducted  our  audits  in  accordance  with  the  standards  of  the  PCAOB.  Those  standards  require  that  we  plan  and 
perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, 
whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of 
the  financial  statements,  whether  due  to  error  or  fraud,  and  performing  procedures  that  respond  to  those  risks.  Such 
procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. 
Our audits also included evaluating the accounting principles used and significant estimates made by management, as well 
as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for 
our opinion. 

Critical Audit Matters 

Critical audit matters are matters arising from the current-period audit of the financial statements that were communicated 
or required to be communicated to the audit committee and that (1) relate to accounts or disclosures that are material to 
the financial statements and (2) involved our especially challenging, subjective, or complex judgments. We determined 
that there are no critical audit matters. 

/s/ DELOITTE & TOUCHE LLP 
San Jose, California 
February 5, 2021 

We have served as the Company’s auditor since 2005. 

34 

 
 
 
POWER INTEGRATIONS, INC. 
CONSOLIDATED BALANCE SHEETS 

     December 31,  

      December 31,  

2020 

2019 

(In thousands, except par value) 
ASSETS 
CURRENT ASSETS: 

Cash and cash equivalents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Short-term marketable securities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Accounts receivable, net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Inventories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Prepaid expenses and other current assets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Total current assets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
PROPERTY AND EQUIPMENT, net  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
INTANGIBLE ASSETS, net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
GOODWILL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
DEFERRED TAX ASSETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
OTHER ASSETS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

Total assets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 

LIABILITIES AND STOCKHOLDERS’ EQUITY 
CURRENT LIABILITIES: 

Accounts payable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Accrued payroll and related expenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Taxes payable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Other accrued liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Total current liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
LONG-TERM INCOME TAXES PAYABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
DEFERRED TAX LIABILITIES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
OTHER LIABILITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Total liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

COMMITMENTS AND CONTINGENCIES (Notes 11, 12 and 13) 
STOCKHOLDERS’ EQUITY: 

Common stock, $0.001 par value 
Authorized - 280,000 shares 
Outstanding - 59,910 and 58,862 shares in 2020 and 2019, respectively  . . . . . . .   
Additional paid-in capital . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Accumulated other comprehensive loss  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Retained earnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Total stockholders’ equity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Total liabilities and stockholders’ equity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 

 258,874   $ 
 190,318  
 35,910  
 102,878  
 13,252  
 601,232  
 166,188  
 12,506  
 91,849  
 3,339  
 28,225  
 903,339   $ 

 34,712   $ 
 14,806  
 902  
 12,106  
 62,526  
 15,588  
 75  
 14,739  
 92,928  

 178,690 
 232,398 
 24,274 
 90,380 
 15,597 
 541,339 
 116,619 
 16,865 
 91,849 
 2,836 
 34,388 
 803,896 

 27,433 
 13,408 
 584 
 9,051 
 50,476 
 14,617 
 164 
 14,093 
 79,350 

 28  
 190,920  
 (2,163) 
 621,626  
 810,411  
 903,339   $ 

 28 
 152,117 
 (3,130)
 575,531 
 724,546 
 803,896 

The accompanying notes are an integral part of these consolidated financial statements. 

35 

 
 
 
 
 
 
 
 
 
 
    
    
 
  
    
    
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
  
   
  
  
 
  
   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
  
   
  
  
 
  
   
  
  
 
  
   
  
  
 
  
   
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
POWER INTEGRATIONS, INC. 
CONSOLIDATED STATEMENTS OF INCOME 

(In thousands, except per share amounts) 
NET REVENUES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $  488,318   $   420,669   $  415,955 
    201,167 
COST OF REVENUES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .        244,728  
    214,788 
GROSS PROFIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .        243,590  

    207,267  
    213,402  

2018 

2020 

Year Ended December 31,  
2019 

OPERATING EXPENSES: 

Research and development . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Sales and marketing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
General and administrative  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Litigation settlement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      

 81,711  
 54,497  
 36,895  
 —  
Total operating expenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .        173,103  
 70,487  
 4,764  
 75,251  
 4,075  
 71,176   $   193,468   $ 

INCOME FROM OPERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
OTHER INCOME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
INCOME BEFORE INCOME TAXES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
PROVISION (BENEFIT) FOR INCOME TAXES . . . . . . . . . . . . . . . . . . . . . . . .      
NET INCOME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 

 73,470  
 54,297  
 37,582  
    (168,969) 
 (3,620) 
    217,022  
 5,392  
    222,414  
 28,946  

 70,580 
 53,064 
 35,496 
 — 
    159,140 
 55,648 
 4,116 
 59,764 
    (10,220)
 69,984 

EARNINGS PER SHARE: 

Basic  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Diluted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 

 1.19   $ 
 1.17   $ 

 3.31   $ 
 3.24   $ 

 1.19 
 1.16 

SHARES USED IN PER SHARE CALCULATION: 

Basic  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Diluted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      

 59,657  
 60,845  

 58,534  
 59,632  

 58,912 
 60,294 

The accompanying notes are an integral part of these consolidated financial statements. The Earnings Per Share 
and Shares Used in Per Share Calculation information presented above reflects the effect of the August 2020 stock split. 
Refer to Note 10, Earnings Per Share, in this Form 10-K for details. 

36 

 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
  
 
     
     
 
     
 
   
 
   
    
   
  
   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
     
 
   
 
   
    
   
  
   
  
  
 
     
 
   
 
   
    
   
  
   
  
  
  
  
  
  
 
 
 
POWER INTEGRATIONS, INC. 
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME 

(In thousands) 
Net income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 

Other comprehensive income (loss), net of tax: 
Foreign currency translation adjustments, net of $0 tax in 2020, 2019 and 
2018 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Unrealized gain on marketable securities, net of $0 tax in 2020, 2019 and 
2018 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Unrealized actuarial gain (loss) on pension benefits, net of tax of ($308), 
$497, and ($144) in 2020, 2019 and 2018, respectively  . . . . . . . . . . . . . . . . . . .      
Total other comprehensive income (loss)  . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
TOTAL COMPREHENSIVE INCOME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 

Year Ended December 31,  
2019 

2020 
 71,176   $   193,468   $ 

2018 
 69,984 

 (183) 

 (518) 

 (236)

 849  

 161 

 307  

 843  
 967  

 (1,772) 
 (1,441) 

 525 
 450 
 70,434 

 72,143   $   192,027   $ 

The accompanying notes are an integral part of these consolidated financial statements. 

37 

 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
  
     
     
    
   
  
   
  
  
  
  
  
  
  
  
  
  
 
 
 
POWER INTEGRATIONS, INC. 
CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY 

  Common Stock 
   Shares     Amount   

  Additional 
Paid-In 
Capital 

      Accumulated        
Other 

  Comprehensive   Retained 

Loss 

   Earnings    

 (2,139)  $ 351,408   $ 

Total 
  Stockholders’ 
Equity 
 547,682 

 —  

 176  

 1,130  
 (242) 

 1,182  
 (3,144) 

(In thousands) 
BALANCE AT JANUARY 1, 2018 . . . . . . . . . . . . . .      59,564   $ 
Issuance of common stock under employee stock 
option and stock award plans . . . . . . . . . . . . . . . . . . . .    
Repurchase of common stock  . . . . . . . . . . . . . . . . . . .    
Issuance of common stock under employee stock 
purchase plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Stock-based compensation expense related to 
employee stock options and awards . . . . . . . . . . . . . . .    
Stock-based compensation expense related to 
 —  
employee stock purchases . . . . . . . . . . . . . . . . . . . . . .    
Payment of dividends to stockholders . . . . . . . . . . . . .    
 —  
 —  
Unrealized actuarial gain on pension benefits . . . . . . .    
Unrealized gain on marketable securities  . . . . . . . . . .    
 —  
 —  
Foreign currency translation adjustment . . . . . . . . . . .    
Net income  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
 —  
BALANCE AT DECEMBER 31, 2018 . . . . . . . . . . . .      57,778  
Issuance of common stock under employee stock 
option and stock award plans . . . . . . . . . . . . . . . . . . . .    
Repurchase of common stock  . . . . . . . . . . . . . . . . . . .    
Issuance of common stock under employee stock 
purchase plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Stock-based compensation expense related to 
employee stock awards . . . . . . . . . . . . . . . . . . . . . . . .    
Stock-based compensation expense related to 
 —  
employee stock purchases . . . . . . . . . . . . . . . . . . . . . .    
 —  
Payment of dividends to stockholders . . . . . . . . . . . . .    
Unrealized actuarial loss on pension benefits  . . . . . . .    
 —  
 —  
Unrealized gain on marketable securities  . . . . . . . . . .    
Foreign currency translation adjustment . . . . . . . . . . .    
 —  
Net income  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
 —  
BALANCE AT DECEMBER 31, 2019 . . . . . . . . . . . .      58,862  
Issuance of common stock under employee stock 
option and stock award plans . . . . . . . . . . . . . . . . . . . .    
Repurchase of common stock  . . . . . . . . . . . . . . . . . . .    
Issuance of common stock under employee stock 
purchase plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Stock-based compensation expense related to 
employee stock awards . . . . . . . . . . . . . . . . . . . . . . . .    
Stock-based compensation expense related to 
employee stock purchases . . . . . . . . . . . . . . . . . . . . . .    
Payment of dividends to stockholders . . . . . . . . . . . . .    
Unrealized actuarial gain on pension benefits . . . . . . .    
Unrealized gain on marketable securities  . . . . . . . . . .    
Foreign currency translation adjustment . . . . . . . . . . .    
Net income  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
BALANCE AT DECEMBER 31, 2020 . . . . . . . . . . . .      59,910   $ 

 —  
 —  
 —  
 —  
 —  
 —  

 963  
 (63) 

 148  

 196  

 —  

 —  

 29   $  198,384   $ 

 —  
 (1) 

 4,010  
   (103,153) 

 —  

 5,343  

 —  

 20,027  

 —  
 —  
 —  
 —  
 —  
 —  
 28  

 —  
 —  

 —  

 1,553  
 —  
 —  
 —  
 —  
 —  
    126,164  

 4,359  
 (7,302) 

 5,549  

 —  

 21,686  

 —  
 —  
 —  
 —  
 —  
 —  
 28  

 —  
 —  

 —  

 1,661  
 —  
 —  
 —  
 —  
 —  
    152,117  

 4,608  
 (2,636) 

 5,919  

 —  

 28,952  

 —  
 —  
 —  
 —  
 —  
 —  
 28   $  190,920   $ 

 1,960  
 —  
 —  
 —  
 —  
 —  

 —  
 —  

 —  

 —  

 —  
 —  

 —  

 —  

 —  
 —  
 525  
 161  
 (236) 
 —  
 (1,689) 

 —  
    (18,823) 
 —  
 —  
 —  
 69,984  
   402,569  

 —  
 —  

 —  

 —  

 —  
 —  

 —  

 —  

 —  
 —  
 (1,772) 
 849  
 (518) 
 —  
 (3,130) 

 —  
    (20,506) 
 —  
 —  
 —  
   193,468  
   575,531  

 —  
 —  

 —  

 —  

 —  
 —  

 —  

 —  

 —  
 —  
 843  
 307  
 (183) 
 —  

 —  
    (25,081) 
 —  
 —  
 —  
 71,176  

 (2,163)  $ 621,626   $ 

 4,010 
 (103,154)

 5,343 

 20,027 

 1,553 
 (18,823)
 525 
 161 
 (236)
 69,984 
 527,072 

 4,359 
 (7,302)

 5,549 

 21,686 

 1,661 
 (20,506)
 (1,772)
 849 
 (518)
 193,468 
 724,546 

 4,608 
 (2,636)

 5,919 

 28,952 

 1,960 
 (25,081)
 843 
 307 
 (183)
 71,176 
 810,411 

The accompanying notes are an integral part of these consolidated financial statements. The Shares presented 
above reflects the effect of the August 2020 stock split. Refer to Note 10, Earnings Per Share, in this Form 10-K for 
details. 

38 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
   
        
 
      
 
 
      
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
POWER INTEGRATIONS, INC. 
CONSOLIDATED STATEMENTS OF CASH FLOWS 

2020 

Year Ended December 31,  
2019 

2018 

 71,176  

$ 

 193,468  

$ 

 69,984 

(In thousands) 
CASH FLOWS FROM OPERATING ACTIVITIES: 
Net income  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 
Adjustments to reconcile net income to net cash provided by operating activities:     
Depreciation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Amortization of intangibles  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Loss on disposal of property and equipment . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Stock-based compensation expense  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Amortization of premium (accretion of discount) on marketable securities . . .       
Deferred income taxes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Increase (decrease) in accounts receivable allowance for credit losses, net . . .       
Change in operating assets and liabilities: 

Accounts receivable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Inventories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Prepaid expenses and other assets  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Accounts payable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Taxes payable and accrued liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Net cash provided by operating activities  . . . . . . . . . . . . . . . . . . . . . . . . . .       

 23,743  
 4,359  
 525  
 30,912  
 705  
 (592) 
 (336) 

 (11,300) 
 (12,498) 
 9,153  
 5,697  
 4,095  
 125,639  

CASH FLOWS FROM INVESTING ACTIVITIES: 

Purchases of property and equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Proceeds from sale of property and equipment . . . . . . . . . . . . . . . . . . . . . . . . .      
Acquisition of technology licenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Purchases of marketable securities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Proceeds from sales and maturities of marketable securities  . . . . . . . . . . . . . .       
Net cash provided by (used in) investing activities . . . . . . . . . . . . . . . . . . .       

 (70,598) 
 651  
 —  
 (109,703) 
 151,385  
 (28,265) 

CASH FLOWS FROM FINANCING ACTIVITIES: 

Issuance of common stock under employee stock plans . . . . . . . . . . . . . . . . . .       
Repurchase of common stock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Payments of dividends to stockholders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Proceeds from draw on line of credit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Payments on line of credit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Net cash used in financing activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       

 10,527  
 (2,636) 
 (25,081) 
 —  
 —  
 (17,190) 

 19,190  
 5,213  
 249  
 23,347  
 (192) 
 4,019  
 57  

 (13,259) 
 (9,523) 
 (2,132) 
 (6,556) 
 10,618  
 224,499  

 (24,114) 
 —  
 (1,026) 
 (207,240) 
 70,334  
 (162,046) 

 9,908  
 (7,302) 
 (20,506) 
 —  
 —  
 (17,900) 

 18,918 
 5,267 
 553 
 21,580 
 227 
 (4,465)
 (28)

 5,754 
 (23,770)
 (1,495)
 1,336 
 (9,897)
 83,964 

 (24,677)
 — 
 (900)
 (62,833)
 157,551 
 69,141 

 9,353 
 (103,153)
 (18,823)
 8,000 
 (8,000)
 (112,623)

NET INCREASE IN CASH AND CASH EQUIVALENTS . . . . . . . . . . . . . . . .       
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD  . . . . . . .       
CASH AND CASH EQUIVALENTS AT END OF PERIOD  . . . . . . . . . . . . . .     $ 

 80,184  
 178,690  
 258,874  

$ 

 44,553  
 134,137  
 178,690  

$ 

 40,482 
 93,655 
 134,137 

SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND 
FINANCING ACTIVITIES: 

Unpaid property and equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 
Unpaid technology licenses  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 

 5,937  
 —  

$ 
$ 

 4,355  
 —  

$ 
$ 

 1,818 
 100 

SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: 

Cash paid (received) for income taxes, net (Note 11) . . . . . . . . . . . . . . . . . . . .     $ 

 (1,973) 

$ 

 21,327  

$ 

 7,437 

The accompanying notes are an integral part of these consolidated financial statements. 

39 

 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
  
     
     
   
    
 
    
 
  
   
  
   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
    
   
  
   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
   
 
 
 
 
 
 
 
    
   
  
   
  
  
  
  
 
 
  
  
  
  
  
  
  
  
 
   
 
 
 
 
 
 
 
    
   
  
   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
   
 
 
 
 
 
 
 
  
  
  
  
 
   
 
 
 
 
 
 
 
    
   
  
   
  
  
 
   
 
 
 
 
 
 
 
    
   
  
   
  
  
 
 
 
POWER INTEGRATIONS, INC. 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 

1. THE COMPANY: 

Power Integrations, Inc. (“Power Integrations” or the “Company”), incorporated in California on March 25, 1988, 
and reincorporated in Delaware in December 1997, designs, develops, manufactures and markets analog and mixed-signal 
integrated  circuits  (ICs)  and  other  electronic  components  and  circuitry  used  in  high-voltage  power  conversion.  The 
Company’s products are used in power converters that convert electricity from a high-voltage source to the type of power 
required for a specified downstream use. A large percentage of the Company’s products are ICs used in AC-DC power 
supplies, which convert the high-voltage AC from a wall outlet to the low-voltage DC required by most electronic devices. 
Power supplies incorporating the Company’s products are used with all manner of electronic products including mobile 
phones,  computing  and  networking  equipment,  appliances,  electronic  utility  meters,  battery-powered  tools,  industrial 
controls, and “home-automation,” or “internet of things” applications such as networked thermostats, power strips and 
other building-automation and security devices. The Company also supplies high-voltage LED drivers, which are AC-DC 
ICs specifically designed for lighting applications that utilize light-emitting diodes. In 2018, the Company introduced a 
new category of power-conversion ICs: a family of motor-driver ICs addressing brushless DC (BLDC) motors used in 
refrigerators, HVAC systems, ceiling fans and other consumer-appliance and light commercial applications. The Company 
also  offers  high-voltage  gate  drivers—either  standalone  ICs  or  circuit  boards  containing  ICs,  electrical  isolation 
components and other circuitry—used to operate high-voltage switches such as insulated-gate bipolar transistors (IGBTs) 
and silicon-carbide (SiC) MOSFETs. These combinations of switches and drivers are used for power conversion in high-
power applications (i.e., power levels ranging from a few kilowatts up to gigawatts) such as industrial motors, solar- and 
wind-power systems, electric vehicles and high-voltage DC transmission systems. 

2. SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS: 

Significant Accounting Policies and Estimates 

Segment Reporting 

The Company is organized and operates as one reportable segment, the design, development, manufacture and 
marketing of integrated circuits and related components for use primarily in the high-voltage power conversion markets. 
The Company’s chief operating decision maker, the Chief Executive Officer, reviews financial information presented on 
a consolidated basis for purposes of making operating decisions and assessing financial performance. 

Principles of Consolidation 

The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries 

after elimination of all intercompany transactions and balances. 

Estimates 

The  preparation  of  financial  statements  in  conformity  with  U.S.  Generally  Accepted  Accounting  Principles 
(GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities 
and  disclosures  of  contingent  assets  and  liabilities  at  the  date  of  the  financial  statements  and  the  reported  amounts  of 
revenues and expenses during the reporting period. Actual results could differ from those estimates. On an ongoing basis, 
the Company evaluates its estimates, including those related to revenue recognition and allowances for receivables and 
inventories. These estimates are based on historical facts and various other factors, which the Company believes to be 
reasonable at the time the estimates are made. However, as the effects of future events cannot be determined with precision, 
actual results could differ significantly from management’s estimates. 

Revenue Recognition 

The  Company  applies  the  provisions  of  Accounting  Standards  Codification  (ASC)  606-10,  Revenue  from 
Contracts with Customers, and all related appropriate guidance. The Company recognizes revenue under the core principle 
to depict the transfer of control to the Company’s customers in an amount reflecting the consideration the Company expects 
to be entitled. In order to achieve that core principle, the Company applies the following five-step approach: (1) identify 

40 

 
the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, 
(4) allocate  the  transaction  price  to  the  performance  obligations  in  the  contract,  and  (5) recognize  revenue  when  a 
performance obligation is satisfied. 

Product  revenues  consist  of  sales  to  original  equipment  manufacturers,  or  OEMs,  merchant  power  supply 
manufacturers and distributors. The Company considers customer purchase orders, which in some cases are governed by 
master sales agreements, to be the contracts with a customer. In situations where sales are to a distributor, the Company 
has concluded that its contracts are with the distributor as the Company holds a contract bearing enforceable rights and 
obligations only with the distributor. As part of its consideration of the contract, the Company evaluates certain factors 
including the customer’s ability to pay (or credit risk). For each contract, the Company considers the promise to transfer 
products, each of which is distinct, to be the identified performance obligations. In determining the transaction price the 
Company evaluates whether the price is subject to refund or adjustment to determine the net consideration to which the 
Company  expects  to  be  entitled.  As  the  Company’s  standard  payment  terms  are  less  than  one year,  the  Company  has 
elected  the  practical  expedient  under  ASC  606-10-32-18  to  not  assess  whether  a  contract  has  a  significant  financing 
component. The Company allocates the transaction price to each distinct product based on their relative standalone selling 
price. The product price as specified on the purchase order is considered the standalone selling price as it is an observable 
input which depicts the price as if sold to a similar customer in similar circumstances. Revenue is recognized when control 
of the product is transferred to the customer (i.e., when the Company’s performance obligation is satisfied), which typically 
occurs at shipment. Further, in determining whether control has transferred, the Company considers if there is a present 
right to payment and legal title, along with risks and rewards of ownership having transferred to the customer. 

Frequently, the Company receives orders for products to be delivered over multiple dates that may extend across 
several  reporting  periods.  The  Company  invoices  for  each  delivery  upon  shipment  and  recognizes  revenues  for  each 
distinct product delivered, assuming transfer of control has occurred. As scheduled delivery dates are within one year, 
under the optional exemption provided by ASC 606-10-50-14 revenues allocated to future shipments of partially completed 
contracts are not disclosed. The Company has also elected the practical expedient under ASC 340-40-25-4 to expense 
commissions  when  incurred  as  the  amortization  period  of  the  commission  asset  the  Company  would  have  otherwise 
recognized is less than one year. 

Sales to international customers that are shipped from the Company’s facility outside of the United States are 
pursuant  to  EX  Works,  or  EXW,  shipping  terms,  meaning  that  control  of  the  product  transfers  to  the  customer  upon 
shipment from the Company’s foreign warehouse. Sales to international customers that are shipped from the Company’s 
facility in California are pursuant to Delivered at Frontier, or DAF, shipping terms. As such, control of the product passes 
to  the  customer  when  the  shipment  reaches  the  destination  country  and  revenue  is  recognized  upon  the  arrival  of  the 
product in that country. Shipments to customers in the Americas are pursuant to Free on Board, or FOB, point of origin 
shipping terms meaning that control is passed to the customer upon shipment. 

Sales to most distributors are made under terms allowing certain price adjustments and limited rights of return 
(known as “stock rotation”) of the Company’s products held in their inventory or upon sale to their end customers. Revenue 
from sales to distributors is recognized upon the transfer of control to the distributor. Frequently, distributors need to sell 
at a price lower than the standard distribution price in order to win business. At the time the distributor invoices its customer 
or  soon  thereafter,  the  distributor  submits  a  “ship  and  debit”  price  adjustment  claim  to  the  Company  to  adjust  the 
distributor’s cost from the standard price to the pre-approved lower price. After the Company verifies that the claim was 
pre-approved, a credit memo is issued to the distributor for the ship and debit claim. In determining the transaction price, 
the Company considers ship and debit price adjustments to be variable consideration. Such price adjustments are estimated 
using the expected value method based on an analysis of actual ship and debit claims, at the distributor and product level, 
over a period of time considered adequate to account for current pricing and business trends. Historically, actual price 
adjustments for ship and debit claims relative to those estimated and included when determining the transaction price have 
not  materially  differed.  Stock  rotation  rights  grant  the  distributor  the  ability  to  return  certain  specified  amounts  of 
inventory. Stock rotation adjustments are an additional form of variable consideration and are also estimated using the 
expected value method based on historical return rates. Historically, distributor stock rotation adjustments have not been 
material. 

Sales to certain distributors are made under terms that do not include rights of return or price concessions after 
the product is shipped to the distributor. Accordingly, upon application of steps one through five above, product revenue 
is recognized upon shipment and transfer of control. 

41 

The  Company  generally  provides  an  assurance  warranty  that  its  products  will  substantially  conform  to  the 
published specifications for twelve months from the date of shipment. The Company’s liability is limited to either a credit 
equal to the purchase price or replacement of the defective part. Returns under warranty have historically been immaterial. 
As such, the Company does not record a specific warranty reserve or consider activities related to such warranty, if any, 
to be a separate performance obligation. 

Inventories 

Inventories (which consist of costs associated with the purchases of wafers from domestic and offshore foundries 
and of packaged components from offshore assembly manufacturers, as well as internal labor and overhead associated 
with the testing of both wafers and packaged components) are stated at the lower of cost (first-in, first-out) or market. 
Provisions, when required, are made to reduce inventories to their estimated net realizable values. 

Income Taxes 

Income-tax expense is an estimate of current income taxes payable or refundable in the current fiscal year based 
on  reported  income before  income  taxes. Deferred  income taxes  reflect  the  effect  of  temporary  differences  and  carry-
forwards that are recognized for financial reporting and income tax purposes. 

The Company accounts for income taxes under the provisions of ASC 740, Income Taxes. Under the provisions 
of ASC 740, deferred tax assets and liabilities are recognized based on the differences between the financial statement 
carrying amounts of existing assets and liabilities and their respective tax bases, utilizing the tax rates that are expected to 
apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The 
Company recognizes valuation allowances to reduce any deferred tax assets to the amount that it estimates will more likely 
than not be realized based on available evidence and management’s judgment. The Company limits the deferred tax assets 
recognized related to certain officers’ compensation to amounts that it estimates will be deductible in future periods based 
upon Internal Revenue Code Section 162(m). In the event that the Company determines, based on available evidence and 
management judgment, that all or part of the net deferred tax assets will not be realized in the future, it would record a 
valuation  allowance  in  the  period  the  determination  is  made.  In  addition,  the  calculation  of  tax  liabilities  involves 
significant judgment in estimating the impact of uncertainties in the application of complex tax laws. Resolution of these 
uncertainties in a manner inconsistent with the Company’s expectations could have a material impact on the Company’s 
results of operations and financial position. 

Goodwill and Intangible Assets 

Goodwill and the Company’s domain name are evaluated in accordance with ASC 350-10, Goodwill and Other 
Intangible Assets, and an impairment analysis is conducted on an annual basis, or sooner if indicators exist for a potential 
impairment. 

In accordance with ASC 360-10, Accounting for the Impairment or Disposal of Long-Lived Assets, long-lived 
assets, such as property and equipment and intangible assets, are reviewed for impairment whenever events or changes in 
circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held 
and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows 
expected  to  be  generated  by  the  asset.  If  the  carrying  amount  of  an  asset  exceeds  its  estimated  future  cash  flows,  an 
impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the 
asset. 

Cash and Cash Equivalents 

The Company considers cash invested in highly liquid financial instruments with maturities of three months or 

less at the date of purchase to be cash equivalents. 

Marketable Securities 

The Company generally holds securities until maturity; however, they may be sold under certain circumstances 
including, but not limited to, when necessary for the funding of acquisitions and other strategic investments. As a result, 
the  Company  classifies  its  investment  portfolio  as  available-for-sale.  The  Company  classifies  all  investments  with  a 

42 

maturity  date  greater  than  three months  at  the  date  of  purchase  as  short-term  marketable  securities  in  its  consolidated 
balance  sheet.  As  of  December 31,  2020,  and  December 31,  2019,  the  Company’s  marketable  securities  consisted 
primarily of commercial paper, corporate bonds, government securities and/or other high-quality commercial securities. 

Employee Benefits Plan 

The Company sponsors a 401(k) tax-deferred savings plan for all employees in the United States who meet certain 
eligibility requirements. Participants may contribute up to the amount allowable as a deduction for federal income tax 
purposes. The Company is not required to contribute; however, the Company contributes a certain percentage of employee 
annual salaries on a discretionary basis, not to exceed an established threshold. The Company provided for a contribution 
of approximately $1.8 million, $1.4 million and $1.3 million in 2020, 2019 and 2018, respectively. 

Retirement Benefit Obligations (Pension) 

The Company recognizes the over-funded or under-funded status of a defined benefit pension or post-retirement 
plan as an asset or liability in the accompanying consolidated balance sheets. Actuarial gains and losses are recorded in 
accumulated other comprehensive loss, a component of stockholders’ equity, and are amortized as a component of net 
periodic cost over the remaining estimated service period of participants. 

Foreign Currency Risk and Foreign Currency Translation 

As  of  December 31,  2020,  the  Company’s  primary  transactional  currency  was  U.S.  dollars;  in  addition,  the 
Company holds cash in Swiss francs and euros to fund the operations of the Company’s Swiss subsidiary. The foreign 
exchange  rate  fluctuation  between  the  U.S.  dollar  versus  the  Swiss  franc  and  euro  is  recorded  in  other  income  in  the 
consolidated statements of income. 

Gains  and  losses  arising  from  the  remeasurement  of  non-functional  currency  balances  are  recorded  in  other 
income in the accompanying consolidated statements of income. The Company realized a foreign exchange transaction 
loss of $0.5 million, $0.3 million and $0.1 million in 2020, 2019, and 2018 respectively. 

The functional currencies of the Company’s other subsidiaries are the local currencies. Accordingly, all assets 
and liabilities are translated into U.S. dollars at the current exchange rates as of the applicable balance sheet date. Revenues 
and expenses are translated at the average exchange rate prevailing during the period. Cumulative gains and losses from 
the translation of the foreign subsidiaries’ financial statements have been included in stockholders’ equity. 

Warranty 

The Company generally warrants that its products will substantially conform to the published specifications for 
12 months from the date of shipment. The Company’s liability is limited to either a credit equal to the purchase price or 
replacement of the defective part. Returns under warranty have historically been immaterial, and as a result, the Company 
does not record a specific warranty reserve. 

Advertising 

Advertising costs are expensed as incurred and amounted to $1.2 million, $1.4 million and $1.2 million in 2020, 

2019 and 2018, respectively. 

Research and Development 

Research and development costs are expensed as incurred. 

Indemnifications 

The  Company  sells  products  to  its  distributors  under  contracts,  collectively  referred  to  as  Distributor  Sales 
Agreements  (DSA).  Each  DSA  contains  the  relevant  terms  of  the  contractual  arrangement  with  the  distributor,  and 
generally includes certain provisions for indemnifying the distributor against losses, expenses, and liabilities from damages 
that  may be  awarded  against  the distributor  in  the  event  the  Company’s  products  are  found  to  infringe upon  a  patent, 
copyright, trademark, or other proprietary right of a third party (Customer Indemnification). The DSA generally limits the 

43 

scope of and remedies for the Customer Indemnification obligations in a variety of industry-standard respects, including, 
but not limited to, limitations based on time and geography, and a right to replace an infringing product. The Company 
also, from time to time, has granted a specific indemnification right to individual customers. 

The  Company  believes  its  internal  development  processes  and  other  policies  and  practices  limit  its  exposure 
related to such indemnifications. In addition, the Company requires its employees to sign a proprietary information and 
inventions agreement, which assigns the rights to its employees’ development work to the Company. To date, the Company 
has not had to reimburse any of its distributors or customers for any losses related to these indemnifications and no material 
claims were outstanding as of December 31, 2020. For several reasons, including the lack of prior indemnification claims 
and the lack of a monetary liability limit for certain infringement cases, the Company cannot determine the maximum 
amount of potential future payments, if any, related to such indemnifications. 

Adoption of New Accounting Standards 

In June 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update 2016-
13, Financial  Instruments  –  Credit  Losses  (Topic  326),  which  modifies  the  measurement  of  expected  credit  losses  on 
certain financial instruments. In addition, for available-for-sale debt securities, the standard eliminates the concept of other-
than-temporary impairment and requires the recognition of an allowance for credit losses rather than reductions in the 
amortized cost of the securities. The Company adopted the new standard in the first quarter of 2020, effective January 1, 
2020, using the modified-retrospective approach. For available-for-sale debt securities, the Company has made a policy 
election  to  present  separately  accrued  interest  receivable  within  prepaid  expenses  and  other  current  assets  on  the 
consolidated balance sheet. Upon adoption, there was no impact on the Company’s consolidated financial statements. 

44 

 
3. COMPONENTS OF THE COMPANY’S CONSOLIDATED BALANCE SHEETS: 

Accounts Receivable 

(In thousands) 
Accounts receivable trade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 
Accrued ship and debit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Allowance for stock rotation and rebate  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Allowance for credit losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    

Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 

2020 
 66,703   $ 
 (26,435) 
 (3,931) 
 (427) 
 35,910   $ 

2019 
 61,036 
 (33,475)
 (2,524)
 (763)
 24,274 

      December 31,         December 31,  

The  Company  maintains  an allowance  for estimated  credit  losses resulting from  the  inability of  customers  to 
make required payments. This allowance is established using estimates formulated by the Company’s management based 
upon factors such as the composition of the accounts receivable aging, historical losses, changes in payments patterns, 
customer creditworthiness, and current economic trends. Receivables determined to be uncollectible are written off and 
deducted from the allowance. 

(In thousands) 
Beginning balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Provision for credit loss expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Receivables written off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Recoveries collected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Ending balance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 

     Allowance for Credit Losses    
Year Ended 
December 31, 2020 

 (763)
 (621)
 198 
 759 
 (427)

Inventories 

(In thousands) 
Raw materials  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 
Work-in-process  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Finished goods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    

Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 

2020 
 32,131   $ 
 39,469  
 31,278  
 102,878   $ 

2019 
 39,058 
 25,982 
 25,340 
 90,380 

      December 31,         December 31,  

Property and Equipment 

(In thousands) 
Land . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 
Construction-in-progress  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Building and improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Machinery and equipment  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Computer software and hardware and office furniture and fixtures  . . . . . . . . . . . . . . . . . .    

Accumulated depreciation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    

Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 

2020 
 22,189   $ 
 34,886  
 64,808  
 202,698  
 55,591  
 380,172  
 (213,984) 
 166,188   $ 

2019 
 21,790 
 18,604 
 55,785 
 168,576 
 52,265 
 317,020 
 (200,401)
 116,619 

      December 31,         December 31,  

Depreciation expense for property and equipment for fiscal years ended December 31, 2020, 2019 and 2018, was 
approximately $23.7 million, $19.2 million and $18.9 million, respectively, and was determined using the straight-line 
method over the following useful lives: 

Building and improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Machinery and equipment  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Computer software and hardware and office furniture and fixtures  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    

4 - 40 years
2 - 8 years
4 - 7 years

45 

 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
     
  
  
  
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
 
 
  
  
  
  
 
 
 
 
 
 
Total property and equipment (excluding accumulated depreciation) located in the United States at December 31, 
2020, 2019 and 2018, was approximately $167.0 million, $160.7 million and $167.6 million, respectively. In 2020, 2019 
and  2018  approximately  14%,  14%  and  12%,  respectively,  of  total  property  and  equipment  (excluding  accumulated 
depreciation) was held in Thailand by one of the Company’s subcontractors. Also in 2020, approximately 14% of total 
property and equipment was held by one of the Company’s subcontractors in Malaysia. No other country held 10% or 
more of total property and equipment in the periods presented. 

Accumulated Other Comprehensive Loss 

Changes in accumulated other comprehensive loss for the three years ended December 31, 2020: 

(In thousands) 
Balance at January 1, 2018 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Other comprehensive income (loss) before reclassifications . .      
Amounts reclassified from accumulated other 
comprehensive loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Other comprehensive income . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Balance at December 31, 2018 . . . . . . . . . . . . . . . . . . . . . . . . . .      
Other comprehensive income (loss) before reclassifications . .      
Amounts reclassified from accumulated other 
comprehensive loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Other comprehensive loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Balance at December 31, 2019 . . . . . . . . . . . . . . . . . . . . . . . . . .      
Other comprehensive income (loss) before reclassifications . .      
Amounts reclassified from accumulated other 
comprehensive loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Other comprehensive income . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Balance at December 31, 2020 . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 

    Unrealized Gains       
 and Losses on 

 Securities 

   Available-for-Sale    Defined Benefit 
   Pension Items 
 (1,237) 
 401  

 (427)  $ 
 161  

Foreign 
 Currency 
 Items 

Total 

$

 (475)   $  (2,139)
 326 
 (236)  

 —  
 161  
 (266) 
 849  

 —  
 849  
 583  
 307  

 —  
 307  
 890   $ 

 124  (1)   
 525  
 (712) 
 (1,839) 

 —  
 (236)  
 (711)  
 (518)  

 124 
 450 
    (1,689)
    (1,508)

 67  (1)   

 (1,772) 
 (2,484) 
 636  

 —  
 (518)  
    (1,229)  
 (183)  

 67 
    (1,441)
    (3,130)
 760 

 207  (1)   
 843  
 (1,641) 

 —  
 (183)  

 207 
 967 
$  (1,412)   $  (2,163)

(1)  This component of accumulated other comprehensive loss is included in the computation of net periodic pension cost for the years 

ended December 31, 2020, 2019 and 2018. 

4. FAIR VALUE MEASUREMENTS: 

ASC 820-10, Fair Value Measurements, clarifies that fair value is an exit price, representing the amount that 
would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As 
such, fair value is a market-based measurement that should be determined based on assumptions that market participants 
would use in pricing an asset or liability. As a basis for considering such assumptions, ASC 820-10 establishes a three-tier 
value hierarchy, which prioritizes the inputs used in measuring fair value as follows: (Level 1) observable inputs such as 
quoted prices for identical assets in active markets; (Level 2) inputs other than the quoted prices in active markets that are 
observable either directly or indirectly; and (Level 3) unobservable inputs in which there is little or no market data, which 
requires the Company to develop its own assumptions. This hierarchy requires the Company to use observable market 
data, when available, and to minimize the use of unobservable inputs when determining fair value. 

The Company’s cash equivalents and investment instruments are classified within Level 1 or Level 2 of the fair-
value hierarchy because they are valued using quoted market prices, broker or dealer quotations, or alternative pricing 
sources  with  reasonable  levels  of price  transparency.  The type  of  instrument valued  based on quoted market prices  in 
active markets primarily includes money market securities. This type of instrument is generally classified within Level 1 
of the fair-value hierarchy. The types of instruments valued based on other observable inputs (Level 2 of the fair-value 
hierarchy) include investment-grade corporate bonds and commercial paper. Such types of investments are valued by using 
a multi-dimensional relational model, the inputs are primarily benchmark yields, reported trades, broker/dealer quotes, 
issuer  spreads,  two-sided  markets,  benchmark  securities,  bids,  offers,  and  reference  data  including  market  research 
publications.  The  Company  does  not  hold  any  instruments  that  would  be  classified  within  Level  3  of  the  fair-value 
hierarchy. 

46 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
       
 
      
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
The fair value hierarchy of the Company’s cash equivalents and marketable securities at December 31, 2020, and 

2019, was as follows: 

(In thousands) 
Corporate securities . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 
Commercial paper . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Money market funds . . . . . . . . . . . . . . . . . . . . . . . . .    

Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 

(In thousands) 
Corporate securities . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 
Commercial paper . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Money market funds . . . . . . . . . . . . . . . . . . . . . . . . .    

Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 

Fair Value Measurement at 
December 31, 2020 
      Quoted Prices in 

Total Fair Value 

Active Markets for 
Identical Assets 
 (Level 1) 

Significant Other 
  Observable Inputs 

 (Level 2) 

 146,658   $ 
 253,855  
 1,634  
 402,147   $ 

 —   $ 
—  
 1,634  
 1,634   $ 

 146,658 
 253,855 
— 
 400,513 

Fair Value Measurement at 
December 31, 2019 
      Quoted Prices in 

Total Fair Value 

Active Markets for 
Identical Assets 
 (Level 1) 

Significant Other 
 Observable Inputs 
(Level 2) 

 232,398   $ 
 146,955  
 2,983  
 382,336   $ 

 —   $ 
—  
 2,983  
 2,983   $ 

 232,398 
 146,955 
— 
 379,353 

The Company did not transfer any investments between level 1 and level 2 of the fair value hierarchy in the years 

ended December 31, 2020, and 2019. 

5. MARKETABLE SECURITIES: 

Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding 

cash equivalents) at December 31, 2020, were as follows: 

(In thousands) 
Investments due in 3 months or less: 

  Amortized 
Cost 

Gross Unrealized 

      Gains 

      Losses 

  Estimated Fair 
     Market Value 

Commercial paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $   43,660   $ 
Corporate securities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Total  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

 19,846  
 63,506  

Investments due in 4-12 months: 

Corporate securities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Total  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

   125,922  
   125,922  

Total marketable securities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $  189,428   $ 

 —   $ 
 44  
 44  

 846  
 846  
 890   $ 

 —   $ 
 —  
 —  

 43,660 
 19,890 
 63,550 

 —  
 —  
 —   $ 

 126,768 
 126,768 
 190,318 

The Company did not have any investments due in twelve months or greater as of December 31, 2020. Accrued 
interest receivable was $0.8 million at December 31, 2020 and was recorded within prepaid expenses and other current 
assets on the condensed consolidated balance sheet. 

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Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding 

cash equivalents) at December 31, 2019, were as follows: 

(In thousands) 
Investments due in 3 months or less: 

  Amortized 
Cost 

Gross Unrealized 

      Gains 

      Losses 

  Estimated Fair 
     Market Value 

Corporate securities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $   15,934   $ 

Total  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

 15,934  

 18   $ 
 18  

 —   $ 
 —  

 15,952 
 15,952 

Investments due in 4-12 months: 

Corporate securities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Total  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

 71,223  
 71,223  

 269  
 269  

 —  
 —  

 71,492 
 71,492 

Investments due in 12 months or greater: 

Corporate securities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Total  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

   144,658  
   144,658  

Total marketable securities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $  231,815   $ 

 302  
 302  
 589   $ 

 (6) 
 (6) 
 (6)  $ 

 144,954 
 144,954 
 232,398 

Accrued interest receivable was $1.3 million at December 31, 2019 and was recorded within prepaid expenses 

and other current assets on the condensed consolidated balance sheet. 

As of December 31, 2020, the Company had no marketable securities classified as available-for-sale (excluding 
cash equivalents) in a continuous unrealized loss position for which an allowance for credit losses was not recorded. The 
following  table  summarizes  marketable  securities  classified  as  available-for-sale  (excluding  cash  equivalents)  in  a 
continuous unrealized loss position for which an allowance for credit losses was not recorded at December 31, 2019: 

Less Than 12 Months 
      Estimated         Gross 
  Fair Market   Unrealized    Fair Market   Unrealized    Fair Market   Unrealized  

12 Months or Longer 
      Estimated        Gross 

      Estimated        Gross 

Total 

(In thousands) 
December 31, 2019 

Value 

Losses 

Value 

Losses 

Value 

Losses 

Corporate securities  . . . . . . . . . . . . . . .    $   13,069   $ 
Total marketable securities  . . . . . . . .    $   13,069   $ 

 (6)   $ 
 (6)   $ 

 —   $ 
 —   $ 

 —   $   13,069   $ 
 —   $   13,069   $ 

 (6)
 (6)

The weighted average interest rate of investments at December 31, 2020 and 2019, was approximately 0.89% and 
2.17%, respectively. In the year ended December 31, 2020, no unrealized losses on marketable securities were recognized 
in income. 

6. GOODWILL AND INTANGIBLE ASSETS: 

The  carrying  amount  of  goodwill  as  of  December 31,  2020  and  2019  was  $91.8  million  with  no  changes  to 

goodwill in any of the respective fiscal years. 

Intangible  assets  consist  primarily  of  developed  technology,  acquired  licenses,  customer  relationships,  trade 

name, domain name, in-process R&D and patent rights, and are reported net of accumulated amortization. 

The Company amortizes the cost of all intangible assets over the shorter of the estimated useful life or the term 
of the developed technology, customer relationships, technology licenses and in-place leases, which range from two to 
twelve years, with the exception of $1.3 million paid to acquire an internet domain name. The Company acquired the rights 
to the internet domain name www.power.com, which is now the Company’s primary domain name; the cost to acquire the 
domain  name  has  been  recorded  as  an  intangible  asset  and  will  not  be  amortized  as  it  has  an  indefinite  useful  life. 
Amortization of  acquired  intangible  assets was  approximately  $4.4  million,  $5.2 million  and $5.3  million  in  the years 
ended December 31, 2020, 2019 and 2018, respectively. The Company does not believe there is any significant residual 
value associated with the following intangible assets: 

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December 31, 2020 
     Accumulated       
  Amortization   

Net 

  Gross 

December 31, 2019 
     Accumulated        
  Amortization   

Net 

(In thousands) 
Domain name . . . . . . . . . . . . . . . . . . . . . . . . . .    $  1,261   $ 
Developed technology. . . . . . . . . . . . . . . . . . .   
Customer relationships . . . . . . . . . . . . . . . . . .   
Technology licenses  . . . . . . . . . . . . . . . . . . . .   

 —   $   1,261 
    12,027 
 1,932 
 1,645 
Total intangible assets  . . . . . . . . . . . . . . . . .    $  57,847   $   (45,341)   $  12,506   $  61,177   $   (44,312)   $  16,865 

    (25,933)  
    (18,098)  
 (281)  

    (29,126)  
    (15,687)  
 (528)  

    37,960  
    20,030  
 1,926  

    37,960  
    16,700  
 1,926  

 —   $  1,261   $   1,261   $ 

 8,834  
 1,013  
 1,398  

  Gross 

The estimated future amortization expense related to definite-lived intangible assets at December 31, 2020, is as 

follows: 

Fiscal Year 
2021 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
2022 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
2023 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
2024 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
2025 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Thereafter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

Estimated  
Amortization 
(In thousands) 
 3,494 
 2,415 
 2,173 
 1,279 
 832 
 1,052 
 11,245 

$ 

$ 

7. STOCK PLANS AND SHARE BASED COMPENSATION: 

The share and per share information for all periods presented in this Form 10-K has been adjusted for the effect 

of the August 2020 stock split. Refer to Note 10, Earnings Per Share, in this Form 10-K for details. 

Stock Plans 

As  of  December 31,  2020,  the  Company  had  three  stock-based  compensation  plans  (the  “Plans”)  which  are 

described below. 

2007 Equity Incentive Plan 

The 2007 Equity Incentive Plan (2007 Plan) was adopted by the board of directors on September 10, 2007, and 
approved by the stockholders on November 7, 2007, as an amendment and restatement of the 1997 Stock Option Plan 
(1997 Plan). The 2007 Plan provides for the grant of incentive stock options, non-statutory stock options, restricted stock 
awards,  restricted  stock  unit  (RSU)  awards,  stock  appreciation  rights,  performance-based  (PSU)  awards,  long-term 
performance based (PRSU) awards and other stock awards to employees, directors and consultants. Pursuant to the 2007 
Plan, the exercise price for incentive stock options and non-statutory stock options is generally at least 100% of the fair 
market value of the underlying shares on the date of grant. Options generally vest over 48 months measured from the date 
of grant. Options generally expire no later than ten years after the date of grant, subject to earlier termination upon an 
optionee’s cessation of employment or service. The 2007 Plan expired in September 2017 with no further grants to be 
made under this plan; however previous grants under this plan shall remain outstanding until they are exercised, vest, 
forfeited or expire. 

2016 Incentive Award Plan 

The  2016  Incentive  Award  Plan  (2016  Plan)  was  adopted  by  the  board  of  directors  on  March 17,  2016  and 
approved by the stockholders on May 13, 2016. The 2016 Plan provides for the grant of RSU awards, PSU awards and 
PRSU  awards.  No  other  forms  of  equity-based  awards,  including  stock  options  and  stock  appreciation  rights,  may  be 
granted under the 2016 Plan. As of December 31, 2020, 2.2 million awards have been issued and approximately 2.8 million 
shares of common stock remain available for future grant under the 2016 Plan. 

49 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
      
 
 
      
 
 
  
  
  
  
  
  
  
  
  
 
 
 
 
 
 
     
 
 
 
  
  
  
  
  
 
 
 
1997 Employee Stock Purchase Plan 

Under  the  1997  Employee  Stock  Purchase  Plan  (Purchase  Plan),  eligible  employees  may  apply  accumulated 
payroll  deductions,  which  may  not  exceed  15%  of  an  employee’s  compensation,  to  the  purchase  of  shares  of  the 
Company’s common stock at periodic intervals. The purchase price of stock under the Purchase Plan is equal to 85% of 
the lower of (i) the fair market value of the Company’s common stock on the first day of each offering period, or (ii) the 
fair market value of the Company’s common stock on the purchase date (as defined in the Purchase Plan). Each offering 
period  consists  of  one  purchase  period  of  approximately  six months'  duration.  An  aggregate  of  7.0  million  shares  of 
common stock were reserved for issuance to employees under the Purchase Plan. As of December 31, 2020, of the shares 
reserved for issuance, 6.6 million shares had been purchased and 0.4 million shares were reserved for future issuance under 
the Purchase Plan. 

Shares Reserved 

As of December 31, 2020, the Company had approximately 3.4 million shares of common stock reserved for 

future grant under all stock plans. 

Stock-Based Compensation 

The Company applies the provisions of ASC 718-10, Stock Compensation. Under the provisions of ASC 718-10, 
the Company recognizes the fair value of stock-based compensation in its financial statements over the requisite service 
period  of  the  individual  grants,  which  generally  equals  a  four-year  vesting  period.  The  Company  uses  estimates  of 
volatility, expected term, risk-free interest rate, dividend yield and forfeitures in determining the fair value of these awards 
and the amount of compensation expense to recognize. The Company uses the straight-line method to amortize all stock 
awards granted over the requisite service period of the award. 

The  following  table  summarizes  the  stock-based  compensation  expense  recognized  in  accordance  with  ASC 

718-10 for the years ended December 31, 2020, 2019 and 2018: 

(In thousands) 
Cost of revenues  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Research and development . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Sales and marketing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
General and administrative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Total stock-based compensation expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 

Year Ended December 31,  
2019 
 1,237   $ 
 8,423  
 5,015  
 8,672  
 23,347   $ 

2020 
 1,963   $ 
 10,378  
 6,290  
 12,281  
 30,912   $ 

2018 
 1,097 
 7,688 
 4,729 
 8,066 
 21,580 

The following table summarizes total compensation expense related to unvested awards not yet recognized, net 
of expected forfeitures, and the weighted average period over which it is expected to be recognized as of December 31, 
2020: 

      Unrecognized Compensation      
Expense for Unvested 
Awards 
(In thousands) 

Weighted Average 
Remaining Recognition 
Period 
 (In years) 

Long-term performance-based awards  . . . . . . . . . . . . . . . . . . . .   
Restricted stock units  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Purchase plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Total unrecognized compensation expense . . . . . . . . . . . . . . . . .   

$ 

$ 

 5,810   
 34,654   
 202   
 40,666   

 1.64 
 2.62 
 0.08 

Stock-based  compensation  expense  in  the year  ended  December 31,  2020,  was  approximately  $30.9  million 
(comprising  approximately  $18.7  million  related  to  restricted  stock  units,  $10.2  million  related  to  performance-based 
awards and $2.0 million related to the Company’s Purchase Plan). 

Stock-based  compensation  expense  in  the year  ended  December 31,  2019,  was  approximately  $23.3  million 
(comprising approximately $17.5 million related to restricted stock units, $4.1 million related to performance-based awards 
and $1.7 million related to the Company’s Purchase Plan). 

50 

 
 
 
 
 
 
 
 
 
 
 
 
  
     
     
  
  
  
  
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
Stock-based  compensation  expense  in  the year  ended  December 31,  2018,  was  approximately  $21.6  million 
comprising approximately $16.6 million related to restricted stock units, $3.4 million related to performance-based awards 
and $1.6 million related to the Company’s Purchase Plan). 

The Company did not grant stock options in the years ended December 31, 2020, 2019 and 2018, and therefore 

no fair-value assumptions are reported. 

The  fair  value  of  employees’  stock  purchase  rights  under  the  Purchase  Plan  was  estimated  using  the  Black-
Scholes model with the following weighted-average assumptions used during the three years ended December 31, 2020, 
2019 and 2018: 

Year Ended December 31,  

2020 
 0.90 %   
Risk-free interest rates  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
 47 %   
Expected volatility rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Expected dividend yield . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
 0.78 %   
Expected term of purchase rights (in years)  . . . . . . . . . . . . . . . . . . . . . . . . .    
 0.50   
Weighted-average estimated fair value of purchase rights . . . . . . . . . . . . . .    $  15.73  

2019 
 2.28 %   
 37 %   
 0.91 %   
 0.50   
  $  19.39  

2018 
 1.94 %  
 31 %  
 0.89 %  
 0.50   
  $  17.33  

A summary of stock options outstanding as of December 31, 2020, and activity during three years then ended, is 

presented below: 

  Weighted- 
  Average 
  Exercise 

Shares 
     (In thousands)      

  Weighted- 
Average 

  Remaining 
  Contractual 

Term 
(In years) 

  Aggregate 
  Intrinsic Value
     (In thousands) 

Outstanding at January 1, 2018  . . . . . . . . . . . . . . . . . . . . . . . . . .    
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Exercised . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Forfeited or expired . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Outstanding at December 31, 2018 . . . . . . . . . . . . . . . . . . . . . . .    
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Exercised . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Forfeited or expired . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Outstanding at December 31, 2019 . . . . . . . . . . . . . . . . . . . . . . .    
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Exercised . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Forfeited or expired . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Outstanding at December 31, 2020 . . . . . . . . . . . . . . . . . . . . . . .    
Vested and Exercisable at December 31, 2020 . . . . . . . . . . . . . .    

 1,022   $ 
 —  
 (352)  $ 
 —  
 670   $ 
 —  
 (335)  $ 
 —  
 335   $ 
 —  
 (243)  $ 
 —  
 92   $ 
 92  

Price 
 14.52   
 —   
 11.30   
 —   
 16.21   
 —   
 12.98   
 —   
 19.44   
 —   
 18.99   
 —   
 20.63   

 1.05   $ 
 1.05   $ 

 5,643 
 5,643 

The total intrinsic value of options exercised during the year ended December 31, 2020, 2019 and 2018, was $9.1 

million, $8.3 million and $7.5 million, respectively. 

The following table summarizes the stock options outstanding at December 31, 2020: 

(shares in thousands) 
Range of Exercise Prices 
$18.48 - $19.75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
$21.44 - $21.44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    

Options Outstanding 
    Weighted Average      Weighted      

Remaining 
  Contractual Term   
 (in years) 

 Average 
 Exercise 
 Price 

  Options Exercisable 

     Weighted 
 Average 
 Exercise 
 Price 

  Options 
  Exercisable  

 0.38    $  18.77   
 1.35   $  21.44   
 1.05   $  20.63   

 28    $   18.77 
 64   $   21.44 
 92   $   20.63 

  Options 
  Outstanding   
 28   
 64   
 92   

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PSU Awards 

Under the performance-based awards program, the Company grants awards in the performance year in an amount 
equal to twice the target number of shares to be issued if the maximum performance metrics are met. The number of shares 
that are released at the end of the performance year can range from zero to 200% of the target number depending on the 
Company’s performance. The performance metrics of this program are annual targets consisting of a combination of net 
revenue, non-GAAP operating earnings and strategic goals. 

As  the  net  revenue,  non-GAAP  operating  income  and  strategic  goals  are  considered  performance  conditions, 
expense  associated  with  these  awards,  net  of  estimated  forfeitures,  is  recognized  over  the  service  period  based  on  an 
assessment of the achievement of the performance targets. The fair value of these PSUs is determined using the fair value 
of the Company’s common stock on the date of the grant, reduced by the discounted present value of dividends expected 
to be declared before the awards vest. If the performance conditions are not achieved, no compensation cost is recognized 
and any previously recognized compensation is reversed. 

A summary of PSU awards outstanding as of December 31, 2020, and activity during the three years then ended, 

is presented below: 

  Weighted- 
Average 

  Weighted- 
Average 
Remaining 

  Aggregate 

Shares 

  Grant Date Fair    Contractual Term    Intrinsic Value
    (In thousands) 

(In years) 

Outstanding at January 1, 2018  . . . . . . . . . . . . . . . . . . . . . . .    
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Vested . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Forfeited or canceled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Outstanding at December 31, 2018 . . . . . . . . . . . . . . . . . . . .    
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Vested . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Forfeited or canceled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Outstanding at December 31, 2019 . . . . . . . . . . . . . . . . . . . .    
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Vested . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Forfeited or canceled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Outstanding at December 31, 2020 . . . . . . . . . . . . . . . . . . . .    
Outstanding and expected to vest at December 31, 2020 . . .    

   (In thousands)     Value Per Share   
 32.00   
 31.44   
 32.00   
 31.44   
 31.44   
 35.06   
 31.44   
 35.06   
 35.06   
 46.31   
 35.06   
 —   
 46.27   

 158   $ 
 178   $ 
 (158)  $ 
 (126)  $ 
 52   $ 
 185   $ 
 (52)  $ 
 (64)  $ 
 121   $ 
 150   $ 
 (121)  $ 
 —  
 150   $ 
 150  

 —   $ 
 —   $ 

 12,219 
 12,219 

The grant-date  fair  value of PSU  awards released, which  were fully vested,  in  the years  ended  December 31, 

2020, 2019 and 2018 was approximately $4.2 million, $1.6 million and $5.1 million, respectively. 

PRSU Awards (Long-term Performance Based) 

The Company’s PRSU program provides for the issuance of PRSUs which will vest based on the Company’s 
performance measured against the PRSU Plan’s established revenue targets. The PRSUs were granted in an amount equal 
to twice the target number of shares to be issued if the maximum performance metrics are met. The actual number of 
shares the recipient receives is determined at the end of a three-year performance period based on results achieved versus 
the Company’s performance goals, and may range from zero to 200% of the target number. Recipients of a PRSU award 
generally  must  remain  employed  by  the  Company  on  a  continuous  basis  through  the  end  of  the  applicable  three-year 
performance period in order to receive shares subject to that award. The performance goals for PRSUs granted in fiscal 
2020, 2019 and 2018 were based on the Company’s annual revenue growth over the respective three-year performance 
period. 

Expense associated with these awards, net of estimated forfeitures, is recorded throughout the year based on an 
assessment of the expected achievement of the performance targets. If the performance conditions are not achieved, no 
compensation cost is recognized and any previously recognized compensation is reversed. 

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A summary of PRSU awards outstanding as of December 31, 2020, and activity during the three years then ended, 

is presented below: 

  Weighted-Average    Aggregate 
Intrinsic 
Value 

Remaining 
  Contractual Term   
 (In years) 

   (In thousands)

Outstanding at January 1, 2018  . . . . . . . . . . . . . . . . . . . . .     
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Vested . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Forfeited or canceled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Outstanding at December 31, 2018 . . . . . . . . . . . . . . . . . .     
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Vested . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Forfeited or canceled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Outstanding at December 31, 2019 . . . . . . . . . . . . . . . . . .     
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Vested . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Forfeited or canceled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Outstanding at December 31, 2020 . . . . . . . . . . . . . . . . . .     
Outstanding and expected to vest at December 31, 2020 .     

Shares 

  Weighted-Average   
  Grant Date Fair 

   (In thousands)     Value Per Share     
 26.40   
 29.95   
 26.23   
 21.63   
 27.74   
 34.09   
 21.63   
 31.50   
 32.03   
 49.67   
 —   
 29.95   
 41.90   

 368   $ 
 144   $ 
 (76)  $ 
 (10)  $ 
 426   $ 
 144   $ 
 (140)  $ 
 (143)  $ 
 287   $ 
 152   $ 
 —    
 (138)  $ 
 301   $ 
 272       

 1.51   $ 
 1.54   $ 

 24,637 
 22,279 

In January 2020 it was determined that no shares subject to the PRSUs granted in 2017 vested in aggregate; thus 
no shares were released to the Company’s executives in 2020. The grant-date fair value of PRSU awards released, which 
were  fully  vested,  in  the years  ended  December 31,  2019  and  2018  was  approximately  $3.0  million  and  $2.0  million, 
respectively. 

RSU Awards 

RSUs granted to employees typically vest ratably over a four-year period, and are converted into shares of the 
Company’s  common  stock  upon  vesting  on  a  one-for-one  basis  subject  to  the  employee’s  continued  service  to  the 
Company over that period. The fair value of RSUs is determined using the fair value of the Company’s common stock on 
the date of the grant, reduced by the discounted present value of dividends expected to be declared before the awards vest. 
Compensation expense is recognized on a straight-line basis over the requisite service period of each grant adjusted for 
estimated forfeitures. 

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A summary of RSU awards outstanding as of December 31, 2020, and activity during the three years then ended, 

is presented below: 

  Weighted-Average    Aggregate 
Intrinsic 
Value 

Remaining 
  Contractual Term   
 (In years) 

   (In thousands)

Outstanding at January 1, 2018  . . . . . . . . . . . . . . . . . . . . .     
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Vested . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Forfeited . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Outstanding at December 31, 2018 . . . . . . . . . . . . . . . . . .     
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Vested . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Forfeited . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Outstanding at December 31, 2019 . . . . . . . . . . . . . . . . . .     
Granted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Vested . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Forfeited . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Outstanding at December 31, 2020 . . . . . . . . . . . . . . . . . .     
Outstanding and expected to vest at December 31, 2020 .     

Shares 

  Weighted-Average   
  Grant Date Fair 

   (In thousands)     Value Per Share     
 27.76   
 31.43   
 26.89   
 29.72   
 29.10   
 34.90   
 28.10   
 31.72   
 31.33   
 44.82   
 30.25   
 36.77   
 35.51   

 1,896   $ 
 550   $ 
 (592)  $ 
 (64)  $ 
 1,790   $ 
 582   $ 
 (603)  $ 
 (50)  $ 
 1,719   $ 
 439   $ 
 (599)  $ 
 (41)  $ 
 1,518   $ 
 1,423       

 1.42   $   124,239 
 1.36   $   116,475 

The  grant-date  fair  value  of  RSUs  vested  in  the years  ended  December 31,  2020,  2019  and  2018,  was 

approximately $18.1 million, $16.9 million and $15.9 million, respectively. 

8. SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES: 

Customer Concentration 

The Company’s top ten customers accounted for approximately 62%, 54% and 56% of revenues in 2020, 2019 
and  2018,  respectively.  A  significant  portion  of  these  revenues  are  attributable  to  sales  of  the  Company’s  products  to 
distributors of electronic components. These distributors sell the Company’s products to a broad, diverse range of end 
users,  including  OEMs  and  merchant power  supply  manufacturers.  Sales  to  distributors  in  2020, 2019  and 2018 were 
$367.7 million, $304.6 million and $313.9 million, respectively. Direct sales to OEMs and power-supply manufacturers 
accounted for the remainder. 

The following customers represented 10% or more of the Company’s net revenues for the respective years: 

Customer 
Avnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Honestar Technologies Co., Ltd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
________________________ 

Year Ended December 31,  
2019 
 11 %    
* 

2020 
 19 %    
 11 %    

2018 

 14 % 
*  

*Total customer revenue was less than 10% of net revenues. 
No other customers accounted for 10% or more of the Company’s net revenues in the periods presented. 

Concentration of Credit Risk 

Financial instruments that potentially subject the Company to concentrations of credit risk consisted principally 
of cash investments and trade receivables. The Company does not have any off-balance-sheet credit exposure related to 
its customers. As of December 31, 2020 and December 31, 2019, 90% and 63% of accounts receivable were concentrated 
with the Company’s top ten customers, respectively. 

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The following customers represented 10% or more of accounts receivable: 

Customer 
Powertech Distribution Ltd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Avnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
________________________ 

December 31,  
2020 

December 31,  
2019 

 10 %   
 50 %   

 10 % 
*  

*Total customer accounts receivable was less than 10% of net accounts receivables. 

No other customers accounted for 10% or more of the Company’s accounts receivable in the periods presented. 

Geographic Net Revenues 

The Company markets its products globally through its sales personnel and a worldwide network of independent 

sales representatives and distributors. Geographic net revenues based on “bill to” customer locations were as follows: 

(In thousands) 
United States of America . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Hong Kong/China . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Taiwan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Korea . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Western Europe (excluding Germany)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Japan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Germany . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      
Other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .      

Total net revenues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $   488,318   $ 

2020 
 11,065   $ 
 306,938  
 21,650  
 40,059  
 33,564  
 17,453  
 23,242  
 34,347  

Year Ended December 31,  
2018 
2019 
 15,315 
 10,662   $ 
 218,752 
 237,341  
 43,081 
 36,297  
 33,877 
 30,395  
 49,834 
 36,025  
 19,897 
 15,496  
 14,403 
 20,197  
 34,256  
 20,796 
 420,669   $   415,955 

9. COMMON STOCK REPURCHASES AND CASH DIVIDENDS: 

Common Stock Repurchases 

Over  the years  the  Company’s  board  of  directors  has  authorized  the  use  of  funds  to  repurchase  shares  of  the 
Company’s common stock, including $110.0 million in 2018, with repurchases to be executed according to pre-defined 
price/volume guidelines. In 2018, 2019 and 2020 the Company purchased approximately 3,144,000, 242,000 and 63,000 
shares, respectively, for approximately $103.2 million, $7.3 million and $2.6 million, respectively. As of December 31, 
2020, the Company had $41.3 million available for future stock repurchases, which has no expiration date. Authorization 
of  future  stock  repurchase  programs  is  at  the  discretion  of  the  board  of  directors  and  will  depend  on  the  Company’s 
financial condition, results of operations, capital requirements and business conditions as well as other factors. 

Common Stock Dividend 

The following table presents the quarterly dividends declared per share of the Company’s common stock for the 

periods indicated: 

First Quarter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Second Quarter  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Third Quarter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Fourth Quarter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 

Year Ended December 31,  
2019 
 0.085   $ 
 0.085   $ 
 0.085   $ 
 0.095   $ 

2020 
 0.095   $ 
 0.105   $ 
 0.110   $ 
 0.110   $ 

2018 
 0.080 
 0.080 
 0.080 
 0.080 

The Company paid a total of approximately $25.1 million, $20.5 million and $18.8 million in cash dividends 

during 2020, 2019 and 2018, respectively. 

In January 2018, the Company’s board of directors declared a $0.080 per share quarterly dividend for each quarter 
in 2018. In January 2019, the Company’s board of directors declared four quarterly cash dividends of $0.085 per share to 
be paid to stockholders of record at the end of each quarter in 2019. In October 2019, the Company’s board of directors 
raised the cash dividends per share with the declaration of five cash dividends, consisting of (a) a dividend of $0.01 per 

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share to be paid to stockholders of record at the end of the fourth quarter in 2019, that was in addition to the dividend of 
$0.085 per share to be paid to stockholders of record at the end of the fourth quarter in 2019 previously declared by the 
board in January 2019, and (b) a dividend of $0.095 per share to be paid to stockholders of record at the end of each quarter 
in 2020. 

In  April  2020,  the  Company’s  board  of  directors  raised  the  cash  dividends  with  the  declaration  of three cash 
dividends  of  $0.105 per  share  (in  lieu  of  the  $0.095 per  share  previously  announced  in  October  2019)  to  be  paid  to 
stockholders of record at the end of each of the second, third and fourth quarter in 2020. In July 2020, the Company’s 
board of directors raised the cash dividends further with the declaration of two cash dividends of $0.11 per share (in lieu 
of the $0.105 per share announced in April 2020) to be paid to stockholders of record at the end of each of the third and 
fourth quarter in 2020. In January 2021, the Company’s board of directors raised the quarterly cash dividend again by 
$0.02 per share with the declaration of four cash dividends of $0.13 per share to be paid to stockholders of record at the 
end of each quarter in 2021. 

10. EARNINGS PER SHARE: 

Basic earnings per share are calculated by dividing net income by the weighted-average shares of common stock 
outstanding during the period. Diluted earnings per share are calculated by dividing net income by the weighted-average 
shares  of  common  stock  and  dilutive  common  equivalent  shares  outstanding  during  the  period.  Dilutive  common 
equivalent shares included in this calculation consist of dilutive shares issuable upon the assumed exercise of outstanding 
common stock options, the assumed vesting of outstanding restricted stock units, the assumed issuance of awards under 
the  stock  purchase  plan  and  contingently  issuable  performance-based  awards,  as  computed  using  the  treasury  stock 
method. 

A summary of the earnings per share calculation is as follows: 

(In thousands, except per share amounts) 
Basic earnings per share: 

Year Ended December 31,  
2019 

2020 

2018 

Net income  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 
Weighted-average common shares  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Basic earnings per share . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 

 71,176   $   193,468   $ 
 59,657  

 58,534  

 1.19   $ 

 3.31   $ 

 69,984 
 58,912 
 1.19 

Diluted earnings per share: (1) 

Net income  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 
Weighted-average common shares  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Effect of dilutive awards: 

Employee stock plans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Diluted weighted-average common shares . . . . . . . . . . . . . . . . . . . . . . . . . .       
Diluted earnings per share . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $ 

 71,176   $   193,468   $ 
 59,657  

 58,534  

 69,984 
 58,912 

 1,188  
 60,845  

 1,098  
 59,632  

 1.17   $ 

 3.24   $ 

 1,382 
 60,294 
 1.16 

(1)  The  Company  includes  the  shares  underlying  performance-based  awards  in  the  calculation  of  diluted  earnings  per  share  if the 
performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary 
conditions  have  not  been  met.  The  Company  has  included  in  the  2020,  2019  and  2018  calculations  those  shares  that  were 
contingently issuable upon the satisfaction of the performance conditions as of the end of the respective periods. 

In the years ended December 31, 2020, 2019, and 2018, no outstanding stock awards were determined to be anti-

dilutive and therefore were excluded from the computation of diluted earnings per share. 

In July 2020, the Company’s board of directors approved a two-for-one stock split in the form of a stock dividend, 
payable on August 18, 2020, to stockholders of record as of the close of business on August 14, 2020. The Company’s 
stockholders received one additional share of common stock for each share of common stock held on August 14, 2020. 
The share and per share information for all periods presented in this Form 10-K has been adjusted for the effect of the 
stock split.  

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11. PROVISION (BENEFIT) FOR INCOME TAXES: 

Income Taxes 

The Company accounts for income taxes under the provisions of ASC 740, Income Taxes. Under the provisions 
of ASC 740, deferred tax assets and liabilities are recognized based on the differences between the financial statement 
carrying amounts of existing assets and liabilities and their respective tax bases, utilizing the tax rates that are expected to 
apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. 

U.S. and foreign components of income before income taxes were: 

(In thousands) 
U.S. operations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Foreign operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

Total income before income taxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 

Year Ended December 31,  
2019 
 82,692   $ 
 139,722  

2020 
 (6,252)  $ 
 81,503  
 75,251   $   222,414   $ 

2018 
 (6,529)
 66,293 
 59,764 

The components of the provision (benefit) for income taxes are as follows: 

(In thousands) 
Current provision (benefit): 

Federal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Foreign . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

Deferred provision (benefit): 

Federal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Foreign . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

Total  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 

Year Ended December 31,  
2019 

2020 

2018 

 2,788   $ 
 (181) 
 1,677  
 4,284  

 18,293   $ 
 184  
 1,293  
 19,770  

 (6,382)
 4 
 938 
 (5,440)

 348  
 —  
 (557) 
 (209) 
 4,075   $ 

 9,683  
 —  
 (507) 
 9,176  

 28,946   $ 

 (4,593)
 — 
 (187)
 (4,780)
 (10,220)

The provision (benefit) for income taxes differs from the amount that would result by applying the applicable 

federal income tax rate to income before income taxes, as follows: 

Provision (benefit) computed at Federal statutory rate . . . . . . . . . . . . . . . .     
Business tax credits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Stock-based compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Foreign income taxed at different rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
GILTI inclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
U.S. Tax Act - transition tax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Deferred tax asset and liability adjustment . . . . . . . . . . . . . . . . . . . . . . . . .     
Valuation allowance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     
Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     

Year Ended December 31,  

2020 
 21.0 %    
 (7.4)  
 (0.1)  
 (22.0)  
 10.7   
 —   
 0.3   
 2.6   
 0.3   
 5.4 %    

2019 
 21.0 %    
 (2.4)  
 (0.2)  
 (12.7)  
 6.2   
 0.1   
 —   
 0.8   
 0.2   
 13.0 %    

2018 
 21.0 % 
 (9.1) 
 (2.2) 
 (25.0) 
 10.6  
 (16.2) 
 —  
 2.8  
 1.0  
 (17.1)% 

The  Company’s  effective  tax  rate  is  impacted  by  the  geographic  distribution  of  the  Company’s  world-wide 
earnings in lower-tax jurisdictions, federal research tax credits and the recognition of excess tax benefits related to share-
based payments. These benefits were partially offset by foreign income subject to U.S. tax, known as global intangible 
low-taxed income. The Company’s primary jurisdiction where foreign earnings are derived is the Cayman Islands, which 
is a non-taxing jurisdiction. Income earned in other foreign jurisdictions was not material. The Company has not been 
granted any incentivized tax rates and does not operate under any tax holidays in any jurisdiction. Additionally, in 2018 
the Company’s effective tax rate was favorably impacted by revisions to the Tax Act resulting in a $9.7 million income 
tax benefit. 

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The components of the net deferred income tax assets (liabilities) were as follows: 

(In thousands) 
Deferred tax assets: 
Other reserves and accruals  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Tax credit carry-forwards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Stock compensation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Capital losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Net operating loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Other . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Valuation allowance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

Deferred tax liabilities: 
Depreciation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

Net deferred tax assets  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 

December 31,  

2020 

2019 

 3,707   $ 
 20,713  
 1,494  
 158  
 2,303  
 1,023  
 (24,160) 
 5,238  

 3,099 
 18,968 
 1,644 
 157 
 899 
 1,000 
 (20,822)
 4,945 

 (1,974) 
 (1,974) 
 3,264   $ 

 (2,273)
 (2,273)
 2,672 

In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that 
some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent 
upon the generation of future taxable income during the periods in which those temporary differences become deductible. 
Management considers the scheduled reversal of deferred tax liabilities and projected future taxable income. In the event 
that the Company determines, based on available evidence and management judgment, that all or part of the net deferred 
tax  assets  will  not  be  realized  in  the  future,  the  Company  would  record  a  valuation  allowance  in  the  period  the 
determination is made. In addition, the calculation of tax liabilities involves significant judgment in estimating the impact 
of uncertainties in the application of complex tax laws. Resolution of these uncertainties in a manner inconsistent with the 
Company’s expectations could have a material impact on its results of operations and financial position. 

As of  December 31,  2020,  the  Company  continues  to  maintain  a valuation  allowance primarily  as  a result of 
capital  losses  for federal  purposes,  and on its  California, New  Jersey  and  Canada  deferred  tax  assets  as  the  Company 
believes that it is not more likely than not that the deferred tax assets will be fully realized. 

As  of  December 31,  2020,  the  Company  had  utilized  all  of  its  federal  research  and  development  tax  credit 
carryforwards. As of December 31, 2020, the Company had California research and development tax credit carryforwards 
of approximately $30.2 million (there is no expiration of research and development tax credit carryforwards for the state 
of California) and California net operating losses of $44.7 million which will begin to expire in 2032. As of December 31, 
2020,  the  Company  had  Canadian  scientific  research  and  experimental  development  tax  credit  carryforwards  of 
approximately  $3.4  million  and  New  Jersey  research  and  experimental  development  tax  credit  carryforwards  of 
approximately $0.7 million, which will start to expire in 2030 and 2026, respectively. 

The  Tax  Act  signed  into  law  on  December 22,  2017,  generally  allows  companies  to  repatriate  accumulated 
foreign earnings without incurring additional U.S. federal taxes beginning after December 31, 2017. Local foreign and 
U.S. states taxes may still be incurred upon repatriation. The Company has not provided for U.S. taxes on its undistributed 
earnings of foreign subsidiaries. The determination of the future tax consequences of the remittance of these earnings is 
not practicable. 

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Unrecognized Tax Benefits 

The  Company  applies  the  provisions  of  ASC  740-10,  relating  to  accounting  for  uncertain  income  taxes. 

Reconciliation of the beginning and ending amount of unrecognized tax benefits: 

(In thousands) 
Unrecognized Tax Benefits Balance at January 1, 2018  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Gross Increase for Tax Positions of Current Year  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Gross Decrease for Tax Positions of Prior Years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Unrecognized Tax Benefits Balance at December 31, 2018  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Gross Increase for Tax Positions of Current Year  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Gross Decrease for Tax Positions of Prior Years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Unrecognized Tax Benefits Balance at December 31, 2019  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Gross Increase for Tax Positions of Current Year  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Gross Decrease for Tax Positions of Prior Years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
Unrecognized Tax Benefits Balance at December 31, 2020  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

      Unrecognized  
Tax Benefits 

$ 

$ 

 16,683 
 1,994 
 (70)
 18,607 
 1,379 
 (937)
 19,049 
 2,002 
 — 
 21,051 

The Company’s total unrecognized tax benefits as of December 31, 2020, 2019 and 2018, were $21.1 million, 
$19.0  million  and  $18.6  million,  respectively.  An  income  tax  benefit  of  $11.1  million,  net  of  valuation  allowance 
adjustments,  would  be  recorded  if  these  unrecognized  tax  benefits  are  recognized.  The  Company  cannot  reasonably 
estimate the amount of the unrecognized tax benefit that could be adjusted in the next twelve months. 

The  Company’s  continuing  practice  is  to  recognize  interest  and/or  penalties  related  to  income  tax  matters  in 
income tax expense. The Company had accrued interest and penalties of $0.1 million as of both December 31, 2020 and 
2019, which have been recorded in long-term income taxes payable in the accompanying consolidated balance sheets. 

As of December 31, 2020, the Company has concluded all U.S. federal income tax matters for the years through 
2012. However, due to tax attributes, the IRS may calculate tax adjustments for subsequent years for positions taken prior 
to 2012. There are currently no pending income tax audits. 

On July 27, 2015, in Altera Corp. v. Commissioner, the U.S. Tax Court issued an opinion related to the treatment 
of stock-based compensation expense in an intercompany cost-sharing arrangement. A final decision was issued by the 
Tax Court in December 2015. In February 2016, the Commissioner appealed the Tax Court decision. On July 24, 2018, 
the U.S. Ninth Circuit Court of Appeals reversed the U.S. Tax Court’s decision Altera Corp. v. Commissioner; the reversal 
was subsequently withdrawn. On June 7, 2019, the Ninth Circuit Court of Appeals overturned the U.S. Tax Court decision; 
finding that the Government had adequately supported in the record that stock-based compensation should be treated as 
an intangible development cost in a cost-sharing arrangement and Treasury’s position on the issue was not a policy change, 
holding stock-based compensation to be a compensable cost under IRC Section 482. 

On February 10, 2020, Altera filed a petition for a writ of certiorari asking the Supreme Court to review the Ninth 
Circuit’s decision. The Supreme Court’s denied the petition for certiorari, and thus the Ninth Circuit’s decision stands. 
The decision above does not impact the Company as it treats stock-based compensation as a compensable cost under IRC 
Section 482. 

12. LEASES AND COMMITMENTS: 

Facilities and Leases 

The  Company  owns  its  main  executive,  administrative,  manufacturing  and  technical  offices  in  San  Jose, 
California. The Company also owns a research and development facility in New Jersey, a design center in Germany and a 
test facility in Switzerland. The Company’s leases consist of operating leases for administrative office spaces, research-
and-development facilities and sales offices in various countries around the world. Effective January 1, 2019, the Company 
adopted Accounting Standards Update 2016-02, Leases (Topic 842), using the optional transition method. The Company 
determines  if an  arrangement  is  a  lease  at  inception. Some  lease  agreements  contain lease  and non-lease  components, 
which are accounted for as a single lease component. Total lease expense was $2.7 million, $2.5 million and $2.2 million 
in the years ended December 31, 2020, 2019 and 2018, respectively, while short-term and variable lease expenses were 
not material during these periods. 

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Balance sheet information related to leases was as follows: 

(In thousands) 
Right-of-use assets 
Operating lease assets . . . . . . . . . . . . . . . . . . . . . . . .    Other assets 
Lease liabilities 
Current operating lease liabilities . . . . . . . . . . . . . . .    Other accrued liabilities 
Non-current operating lease liabilities . . . . . . . . . . .    Other liabilities 

  Balance Sheet Classification 

Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

      December 31,  

2020 

  December 31,  
2019 

  $ 

 10,295   $ 

 9,521 

  $ 

  $ 

 2,682   $ 
 7,345  
 10,027   $ 

 1,954 
 7,031 
 8,985 

Initial lease terms are determined at commencement and may include options to extend or terminate the lease 
when it is reasonably certain the Company will exercise the option. Remaining lease terms range from one to eight years, 
some  of  which  include  options  to  extend  for  up  to  six years,  and  some  of  which  include  options  to  terminate  within 
one year. Leases with an initial term of twelve months or less are not recorded on the balance sheet. As the Company’s 
leases  do  not  provide  an  implicit  rate,  the  present  value  of  future  lease  payments  is  determined  using  the  Company’s 
incremental borrowing rate based on information available at commencement date. 

Lease term and discount rate 
Weighted average remaining lease term . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Weighted average discount rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    

2020 
4.2 years  
3.3 % 

      December 31,  

December 31,  
2019 
 4.8 years
 3.9 % 

Supplemental cash flows information related to leases was as follow: 

(In thousands) 
Cash paid for amounts included in the measurement of lease liabilities: 

Year Ended December 31,  
2020 

2019 

Operating cash flows from operating leases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Right-of-use assets obtained in exchange for new operating lease obligations  . . . . . . . .    $ 

 2,459   $ 
 2,947   $ 

 2,964 
 4,884 

Future  minimum  lease  payments  under  all  non-cancelable  lease  agreements  as  of  December 31,  2020,  are  as 

follows: 

(In thousands) 
2021 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   
2022 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
2023 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
2024 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
2025 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Thereafter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Total future minimum lease payments  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Less imputed interest  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   

$ 

$ 

2020 

 2,964 
 2,840 
 2,477 
 1,334 
 342 
 830 
 10,787 
 (760)
 10,027 

      December 31,  

Purchase Obligations 

At December 31, 2020, the Company had no non-cancelable purchase obligations that were due beyond one year. 

13. LEGAL PROCEEDINGS AND CONTINGENCIES: 

From time to time in the ordinary course of business, the Company becomes involved in lawsuits, or customers 
and distributors may make claims against the Company. In accordance with ASC 450-10, Contingencies, the Company 
makes a provision for a liability when it is both probable that a liability has been incurred and the amount of the loss can 
be reasonably estimated. 

60 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
     
 
 
   
  
   
  
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
On April 1, 2016, Opticurrent, LLC filed a complaint against the Company in the United States District Court for 
the Eastern District of Texas alleging that the Company infringed one patent pertaining to transistor switch devices and 
seeking damages for the alleged infringement. The Company filed a motion to transfer the case to the Northern District of 
California, which the Court granted, and the case was assigned to a new judge in San Francisco following the transfer. On 
December  21,  2018,  the  Court  granted  the  Company’s  challenge  to  Opticurrent’s  damages  expert  but  denied  the 
Company’s  motion  for  summary  judgment.  Following  a  trial  in  February  2019,  a  jury  issued  a  finding  of  direct 
infringement by the Company but found that the Company did not induce infringement, and awarded Opticurrent damages 
of $6.7 million.  The  Company  challenged  those  findings  in  post-trial  proceedings,  and  the  Court  granted  one  of  the 
Company’s post-trial motions, reducing the damages award to $1.2 million. Although the Court of Appeals affirmed the 
original findings and the reduced damages award, the Company believes it has strong defenses, and intends to continue to 
vigorously defend itself against Opticurrent’s claims, including through a pending motion to set aside the judgment in 
view of a disclaimer that Opticurrent made during reexamination proceedings, which has been fully briefed and argued, 
with rulings expected in the coming months. 

On June 19, 2019, Opticurrent, LLC filed a follow-on lawsuit in the United States District Court for the Northern 
District  of  California  accusing  more  of  the  Company’s  products  of  infringement  and  seeking  damages  for  the  alleged 
infringement of the same claim of the same patent asserted in the parties’ prior litigation, as described above. Limited 
discovery has taken place, but proceedings are currently stayed pending resolution of the Company’s motion to set aside 
the judgment in the parties’ prior litigation, and no schedule has yet been set for expert discovery, dispositive motions, or 
trial. The Company believes it has strong defenses, and intends to vigorously defend itself against Opticurrent’s claims, 
with appeals to follow if necessary. 

On January 6, 2020, the Company filed a complaint against CogniPower LLC in the United States District Court 
for  the  District  of  Delaware  for  infringement  of two of  the  Company’s  patents  and  seeking  a  declaration  of  non-
infringement with respect to patents that CogniPower had charged the Company’s customers with infringing, based on 
customer use of the Company’s products. In response, CogniPower filed a motion to dismiss the Company’s declaratory 
judgment claims on the basis that CogniPower had not threatened the Company directly with suit. That motion was granted, 
so  CogniPower’s  claims  for  infringement  initially  went  forward  separately  in  their  lawsuit  against  the  Company’s 
customers in the District of Delaware, but the Company filed a motion to intervene in that lawsuit and received a ruling 
allowing the Company to intervene in CogniPower’s customer lawsuit on February 1, 2021. Fact discovery and claim 
construction proceedings are now under way, but the Company believes it has strong claims and defenses, and intends to 
vigorously  defend  itself  against  CogniPower’s  claims  against  the  Company’s  technology,  with  appeals  to  follow  if 
necessary. 

The Company is unable to predict the outcome of legal proceedings with certainty, and there can be no assurance 
that  Power  Integrations  will  prevail  in  the  above-mentioned  unsettled  litigations.  These  litigations,  whether  or  not 
determined in Power Integrations’ favor or settled, will be costly and will divert the efforts and attention of the Company’s 
management and technical personnel from normal business operations, potentially causing a material adverse effect on the 
business, financial condition and operating results. Currently, the Company is not able to estimate a loss or a range of loss 
for the ongoing litigation disclosed above, however adverse determinations in litigation could result in monetary losses, 
the loss of proprietary rights, subject the Company to significant liabilities, require Power Integrations to seek licenses 
from third parties or prevent the Company from licensing the technology, any of which could have a material adverse 
effect on the Company’s business, financial condition and operating results. 

14. RETIREMENT PLANS: 

The Company sponsors a defined benefit pension plan (Pension Plan) for its Swiss subsidiary in accordance with 
the legal requirements of Switzerland. The plan assets, which provide benefits in the event of an employee’s retirement, 
death or disability, are held in legally autonomous trustee-administered funds that are subject to Swiss law. Benefits are 
based on the employee’s age, years of service and salary, and the plan is financed by contributions by both the employee 
and the Company. 

The net periodic benefit cost of the Pension Plan was not material to the Company’s financial statements during 
the years ended December 31, 2020, 2019 and 2018. At December 31, 2020, the projected benefit obligation was $16.6 
million, the plan assets were $9.7 million and the net pension liability was $6.9 million. As of December 31, 2019, the 
projected benefit obligation was $14.8 million, the plan assets were $8.2 million, and the net pension liability was $6.6 
million. The Company has recorded the unfunded amount as a liability in its consolidated balance sheet at December 31, 

61 

2020 and 2019, under the other liabilities caption. The Company expects to make contributions to the Pension Plan of 
approximately $0.4 million during 2021. The unrealized actuarial loss on pension benefits, net of tax, at December 31, 
2020, 2019 and 2018 was $1.6 million, $2.5 million and $0.7 million, respectively. These amounts were reflected in Note 3 
under the caption accumulated other comprehensive loss. 

In  accordance  with  the  Compensation-Retirement  Benefits  Topic  of  ASC  715-20,  Defined  Benefits  Plan,  the 
Company recognizes the over-funded or under-funded status of its defined post-retirement plan as an asset or liability in 
its statement of financial position. The Company measured the plan assets and benefit obligations as of the date of the 
fiscal year-end. 

15. BANK LINE OF CREDIT: 

On  July 27,  2016,  the  Company  entered  into  a  credit  agreement  with  a  bank  (the  "Credit  Agreement")  that 
provides the Company with a $75.0 million revolving line of credit to use for general corporate purposes with a $20.0 
million sub-limit for the issuance of standby and trade letters of credit. The Credit Agreement was amended on April 30, 
2018, to extend the termination date from July 26, 2019, to April 30, 2022, with all other terms remaining the same. The 
Company’s  ability  to  borrow  under  the  revolving  line  of  credit  is  conditioned  upon  the  Company’s  compliance  with 
specified covenants, including reporting and financial covenants, primarily a minimum cash requirement and a debt to 
earnings ratio. The Credit Agreement terminates on April 30, 2022; all advances under the revolving line of credit will 
become due on such date, or earlier in the event of a default. The Company was compliant with all covenants and had no 
advances outstanding under the Credit Agreement. 

16. SELECTED QUARTERLY INFORMATION (Unaudited): 

The following tables set forth certain data from the Company’s consolidated statements of income for each of the 

quarters in the years ended December 31, 2020 and 2019. 

The unaudited quarterly consolidated financial statements have been prepared on the same basis as the audited 
consolidated financial statements contained herein and include all adjustments that the Company considers necessary for 
a fair presentation of such information when read in conjunction with the Company’s annual audited consolidated financial 
statements and notes thereto appearing elsewhere in this report. The operating results for any quarter are not necessarily 
indicative of the results for any subsequent period or for the entire fiscal year. 

Three Months Ended  
(unaudited) 

Dec. 31, 
2020 

  Sept. 30, 

  June 30, 

  Mar. 31, 

  Sept. 30, 

  Dec. 31, 
    2019(1) 

  June 30, 
2019 

  Mar. 31, 
2019 

2020 
(In thousands, except per share data) 
Net revenues . . . . . . . . . . . . . . . . . . .  $   150,693    $   121,129    $   106,832    $   109,664    $   114,457    $   114,159    $   102,865    $  89,188 
    45,474 
Gross profit . . . . . . . . . . . . . . . . . . . .    
 7,233 
Net income . . . . . . . . . . . . . . . . . . . .  $ 
Earnings per share (2) 

 56,480   
 15,886    $   158,291    $ 

 74,005   
 27,278    $ 

 59,569   
 14,820    $ 

 53,536   
 13,192    $ 

 51,572   
 10,845    $ 

 58,131   
 17,099    $ 

 58,225   

2020 

2020 

2019 

Basic . . . . . . . . . . . . . . . . . . . . . . .  $ 
Diluted . . . . . . . . . . . . . . . . . . . . . .  $ 
Shares used in per share calculation (2)    
Basic . . . . . . . . . . . . . . . . . . . . . . .    
Diluted . . . . . . . . . . . . . . . . . . . . . .    

 0.46    $ 
 0.45    $ 

 0.25    $ 
 0.24    $ 

 0.22    $ 
 0.22    $ 

 0.27    $ 
 0.27    $ 

 2.69    $ 
 2.64    $ 

 0.29    $ 
 0.29    $ 

 0.19    $ 
 0.19    $ 

 0.13 
 0.13 

 59,879   
 61,176   

 59,823   
 60,852   

 59,712   
 60,624   

 59,204   
 60,268   

 58,854   
 60,010   

 58,770   
 59,732   

 58,594   
 59,404   

    57,902 
    58,892 

(1)  In October 2019, the Company entered into a favorable litigation settlement with ON Semiconductor Corporation 

which resulted in a $169.0 million net gain. 

(2)  In July 2020, the Company’s board of directors approved a two-for-one stock split in the form of a stock dividend, 
payable on August 18, 2020, to stockholders of record as of the close of business on August 14, 2020. The Company’s 
stockholders received one additional share of common stock for each share  of common stock held on August 14, 
2020. The share and per share information for all periods presented in this Form 10-K has been adjusted for the effect 
of the stock split (Refer to Note 10, Earnings Per Share, in this Form 10-K for details). 

62 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
   
   
     
   
  
  
  
  
  
  
  
   
  
   
  
   
  
   
  
   
  
   
  
   
  
  
   
  
   
  
   
  
   
  
   
  
   
  
   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
Schedule II 

Valuation and Qualifying Accounts 

The Company maintains an allowance for the distributors’ ship and debit credits relating to the sell-through of 
the Company’s products. This reserve is established using the Company’s historical ship and debit amounts and levels of 
inventory in the distributor channels. 

The following is a summary of the activity in the allowance for ship and debit credits: 

      Balance at         Charged to        

(In thousands) 
Allowance for ship and debit credits: 
Year ended December 31, 2018 . . . . . . . . . . . . . . . . . . . . . . . . .  
  $ 
Year ended December 31, 2019 . . . . . . . . . . . . . . . . . . . . . . . . .    $ 
Year ended December 31, 2020 . . . . . . . . . . . . . . . . . . . . . . . . .    $ 

  Beginning of 
Period 

 Costs and  

      Expenses 

     Deductions(1)      

  Balance at End 
of Period 

 39,486   $   242,068   $  (241,436)  $ 
 40,118   $   230,278   $  (236,921)  $ 
 33,475   $   257,765   $  (264,805)  $ 

 40,118 
 33,475 
 26,435 

(1)  Deductions relate to ship and debit credits issued which adjust the sales price from the standard distribution price to 
the  pre-approved  lower  price.  Refer  to  Note 2,  Significant  Accounting  Policies  and  Recent  Accounting 
Pronouncements, for the Company’s revenue recognition policy, including the Company’s accounting for ship and 
debit claims. 

63 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
       
 
 
 
   
 
     
     
 
     
 
     
 
     
 
 
 
 
Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure. 

Not applicable. 

Item 9A. Controls and Procedures. 
Evaluation of Disclosure Controls and Procedures 

Management is required to evaluate our disclosure controls and procedures, as defined in Rule 13a-15(e) under 
the Securities Exchange Act of 1934, as amended, or the Exchange Act. Disclosure controls and procedures are controls 
and other procedures designed to provide reasonable assurance that information required to be disclosed in our reports 
filed under the Exchange Act, such as this Annual Report on Form 10-K, is recorded, processed, summarized and reported 
within the time periods specified in the Securities and Exchange Commission’s rules and forms. Disclosure controls and 
procedures include controls and procedures designed to provide reasonable assurance that such information is accumulated 
and communicated to our management, including our Chief Executive Officer and Chief Financial Officer as appropriate 
to allow timely decisions regarding required disclosure. Our disclosure controls and procedures include components of 
our internal control over financial reporting, which consists of control processes designed to provide reasonable assurance 
regarding the reliability of our financial reporting and the preparation of financial statements in accordance with generally 
accepted accounting principles in the U.S. To the extent that components of our internal control over financial reporting 
are  included  within  our  disclosure  controls  and  procedures,  they  are  included  in  the  scope  of  our  periodic  controls 
evaluation. Based on our management’s evaluation (with the participation of our principal executive officer and principal 
financial officer), our principal executive officer and principal financial officer have concluded that our disclosure controls 
and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) were effective as of the end of the 
period covered by this report. 
Management’s Report on Internal Control Over Financial Reporting 

Management is responsible for establishing and maintaining adequate internal control over financial reporting, 
as  defined  in  Rule 13a-15(f) under  the  Exchange  Act.  Internal  control  over  financial  reporting  is  designed  to  provide 
reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external 
reporting purposes in accordance with generally accepted accounting principles. Internal control over financial reporting 
includes those policies and procedures that: 

• 

• 

• 

pertain  to  the  maintenance  of  records  that,  in  reasonable  detail,  accurately  and  fairly  reflect  the 
transactions and dispositions of our assets; 
provide  reasonable  assurance  that  transactions  are  recorded  as  necessary  to  permit  preparation  of 
financial statements in accordance with generally accepted accounting principles and that receipts and 
expenditures  are  being  made  only  in  accordance  with  authorizations  of  our  management  and 
directors; and 
provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use 
or disposition of our assets that could have a material effect on the financial statements. 

Internal  control  over  financial  reporting  cannot  provide  absolute  assurance  of  achieving  financial  reporting 
objectives because of its inherent limitations. Internal control over financial reporting is a process that involves human 
diligence and compliance and is subject to lapses in judgment and breakdowns resulting from human failures. Because of 
such limitations, there is a risk that material misstatements may not be prevented or detected on a timely basis by internal 
control over financial reporting. 

Management  conducted  an  assessment  of  Power  Integrations’  internal  control  over  financial  reporting  as  of 
December 31, 2020, based on the framework established by the Committee of Sponsoring Organization (COSO) of the 
Treadway Commission in Internal Control - Integrated Framework issued in 2013. Based on this assessment, management 
concluded that, as of December 31, 2020, our internal control over financial reporting was effective. 

The effectiveness of Power Integrations’ internal control over financial reporting as of December 31, 2020, has 
been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their report which 
appears below. 
Changes in Internal Control over Financial Reporting 

There were no changes in our internal controls over financial reporting during the fourth quarter of 2020, which 
were identified in connection with management’s evaluation required by paragraph (d) of Rules 13a-15 and 15d-15 under 
the  Exchange  Act,  that  have  materially  affected  or  are  reasonably  likely  to  materially  affect  our  internal  control  over 
financial reporting. 

64 

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM 

To the Stockholders and the Board of Directors of Power Integrations, Inc. 

Opinion on Internal Control over Financial Reporting 

We have audited the internal control over financial reporting of Power Integrations, Inc. and subsidiaries (the “Company”) 
as of December 31, 2020, based on criteria established in Internal Control - Integrated Framework (2013) issued by the 
Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, 
in  all  material  respects,  effective  internal  control  over  financial  reporting  as  of  December  31,  2020,  based  on  criteria 
established in Internal Control - Integrated Framework (2013) issued by COSO. 

We  have  also  audited,  in  accordance  with  the  standards  of  the  Public  Company  Accounting  Oversight  Board  (United 
States) (PCAOB), the consolidated financial statements as of and for the year ended December 31, 2020, of the Company 
and our report dated February 5, 2021 expressed an unqualified opinion on those consolidated financial statements and 
included an explanatory paragraph relating to the Company’s adoption of Accounting Standards Update (ASU) 2016-02, 
Leases (Topic 842). 

Basis for Opinion  

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its 
assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s 
Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal 
control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are 
required  to  be  independent  with  respect  to  the  Company  in  accordance  with  the  U.S.  federal  securities  laws  and  the 
applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. 

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform 
the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained 
in  all  material  respects.  Our  audit  included  obtaining  an  understanding  of  internal  control  over  financial  reporting, 
assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal 
control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. 
We believe that our audit provides a reasonable basis for our opinion. 

Definition and Limitations of Internal Control over Financial Reporting 

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the 
reliability  of  financial  reporting  and  the  preparation  of  financial  statements  for  external  purposes  in  accordance  with 
generally accepted accounting principles. A company’s internal control over financial reporting includes those policies 
and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the 
transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded 
as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, 
and that receipts and expenditures of the company are being made only in accordance with authorizations of management 
and  directors  of  the  company;  and  (3)  provide  reasonable  assurance  regarding  prevention  or  timely  detection  of 
unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial 
statements. 

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, 
projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate 
because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. 

/s/ DELOITTE & TOUCHE LLP 
San Jose, California 
February 5, 2021 

65 

 
 
 
Item 9B. Other Information. 

Compensation Matters 

On February 1, 2021, the Compensation Committee of the Board of Directors of Power Integrations, Inc. (the 
“Company”)  took  the  following  compensation  actions  with  respect  to  the  Company’s  chief  executive  officer,  chief 
financial officer, and other “named executive officers” as defined in Rule 402 of SEC Regulation S-K (collectively, the 
“Officers”). 

2021 Performance-based Incentive Plan 

Approved the 2021 Performance-based Incentive Plan (the “2021 PSU Plan”) as follows: 

Each Officer, as described below, was granted performance stock units, referred to as “PSUs,” which will vest 
(referred to as a “payout” below) based on Company performance as against the 2021 PSU Plan’s established net revenue 
targets, non-GAAP operating income targets and strategic goals, each as established by the Compensation Committee. The 
2021  target  net  revenue  and  non-GAAP  operating  income  levels  are  intended  to  have  difficulty  in  attainment  levels 
consistent with the Company’s 2020 PSU Plan. 

The portion of the performance stock units granted under the 2021 PSU Plan that will vest will be calculated 
independently for each of its net revenue, non-GAAP operating income and strategic goals components. “Net revenue” is 
as set forth in the Company’s annual report for 2021 to be filed with the Securities and Exchange Commission (“SEC”). 
“Non-GAAP operating income” means operating income for 2021 determined in accordance with GAAP but excluding 
the  following  items:  (i) stock-based  compensation  expenses  recorded  under  Accounting  Standards  Codification  718; 
(ii) amortization of acquisition-related intangible assets, and the fair-value write-up of acquired inventory; (iii) any other 
mergers and acquisitions related expenses; and (iv) any other adjustment made to arrive at the Company’s non-GAAP 
financial information as presented in the Company’s SEC filings. Further, in the event of any mergers, acquisitions or 
divestitures, or any patent or other litigation settlements or judgments, during the performance period, the net revenue and 
non-GAAP operating income targets shall be adjusted based on a revised plan approved by the Board of Directors. The 
strategic goals component is made up of five different strategic goals for the Company. 

Weighting of the target components is as follows: 

Net revenue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       
Non-GAAP operating income  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Strategic goals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    
Total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    

 40 %
 30 %
 30 %
 100 %

Net Revenue Component of the 2021 PSU Plan: 

No payout will be made under the net revenue component of the 2021 PSU Plan if the Company’s 2021 actual 
net revenue does not exceed at least the established minimum amount of net revenue as set forth in the 2021 PSU Plan. To 
the extent 2021 actual net revenue is above the minimum amount of net revenue, the payout increases linearly from zero 
at the minimum amount of net revenue as set forth in the 2021 PSU Plan up to 100% of the net revenue component of the 
target when actual net revenue equals target net revenue in the 2021 PSU Plan. If 2021 actual net revenue is above the 
target amount of net revenue, then the payout for performance above target increases linearly from the target amount up 
to  a  maximum  of  200%  of  the  net  revenue  component  of  the  target  when  actual  net  revenue  equals  or  exceeds  the 
established target to achieve the maximum payout under the net revenue component of the 2021 PSU Plan. 

Non-GAAP Operating Income Component of the 2021 PSU Plan: 

No  payout  will  be  made  under  the  non-GAAP  operating  income  component  of  the  2021  PSU  Plan  if  the 
Company’s 2021 actual non-GAAP operating income does not exceed at least the established minimum amount of non-
GAAP operating income as set forth in the 2021 PSU Plan. To the extent 2021 actual non-GAAP operating income is 
above the minimum amount of non-GAAP operating income, the payout increases linearly from zero at the minimum 
amount of non-GAAP operating income as set forth in the 2021 PSU Plan up to 100% of the non-GAAP operating income 
component of the target when actual non-GAAP operating income equals target non-GAAP operating income in the 2021 
PSU Plan. If 2021 actual non-GAAP operating income is above the target amount of non-GAAP operating income, then 

66 

 
 
 
 
 
the payout for performance above target increases linearly from the target amount up to a maximum of 200% of the non-
GAAP  operating  income  component  of  the  target  when  actual  non-GAAP  operating  income  equals  or  exceeds  the 
established target to achieve the maximum payout under the non-GAAP operating income component of the 2021 PSU 
Plan. 

Strategic Goals Component of the 2021 PSU Plan: 

Each of the five goals in the strategic goals component of the 2021 PSU Plan is assigned a weighting percentage, 
which percentages  range  from  2%  to  14%,  and  which  collectively  add  up  to  30%.  If  the  Company’s  2021  actual 
achievement of a goal does not exceed at least the established minimum requirement for a particular goal, then no amount 
is earned for that goal. To the extent 2021 actual performance for a goal is better than the established minimum for the 
goal, then the payout increases linearly from zero at the minimum amount of performance as set forth in the 2021 PSU 
Plan up to 100% of the amount for that goal when actual performance equals target performance for that goal in the 2021 
PSU Plan. To the extent 2021 actual performance for a goal is better than the established target for the goal, then the payout 
for performance above target increases linearly from the target amount actual performance, up to a maximum of 200% for 
the specific goal when actual performance equals or exceeds the established target to achieve the maximum payout under 
the specific goal as set forth in the 2021 PSU Plan. 

2021 Target Performance Stock Units 

Approved the 2021 target performance stock units for the Officers as follows: 

     Title 

Executive Officer 
Balu Balakrishnan . . . . . . . . . . . . . . . .     President and Chief Executive Officer   
Sandeep Nayyar . . . . . . . . . . . . . . . . . .     Chief Financial Officer 
Radu Barsan . . . . . . . . . . . . . . . . . . . . .     Vice President, Technology 
David “Mike” Matthews . . . . . . . . . . .     Vice President, Product Development   
Ben Sutherland  . . . . . . . . . . . . . . . . . .     Vice President, Worldwide Sales 

2021 Target PSUs 
11,000 
3,500 
3,000 
2,300 
2,300 

The actual number of shares subject to the performance stock units is twice the target level shown in the table 
above to enable the payout of up to 200% of the target amount if the actual net revenue, non-GAAP operating income and 
strategic goals achievement equal or exceed the established levels to achieve the maximum amount of the 2021 PSU Plan. 

2021 Restricted Stock Unit Grants 

Approved restricted stock units, referred to as “RSUs,” grants to the following Officers: 

     Title 

Executive Officer 
Balu Balakrishnan . . . . . . . . . . . . . . . .     President and Chief Executive Officer   
Sandeep Nayyar . . . . . . . . . . . . . . . . . .     Chief Financial Officer 
Radu Barsan . . . . . . . . . . . . . . . . . . . . .     Vice President, Technology 
David “Mike” Matthews . . . . . . . . . . .     Vice President, Product Development   
Ben Sutherland  . . . . . . . . . . . . . . . . . .     Vice President, Worldwide Sales 

2021 RSU Grants 
30,000 
12,000 
9,900 
7,500 
7,500 

The RSU grants will be effective on the grant date. Twenty-five percent (25%) of the RSUs vest on the one-year 
anniversary of the vesting commencement date (as specified in the Officers’ RSU award agreements), and an additional 
twenty-five percent  (25%) of  the  RSUs  vest  annually  over  the  next  three  (3) years  thereafter,  subject  to  the  respective 
Officer’s continuous service. 

2021 Long-term Performance-Based Incentive Plan 

Approved the 2021 Long-term Performance-Based Incentive Plan (“2021 PRSU Plan”) as follows: 

Each Officer, as described below, was granted long term performance stock units, referred to as “PRSUs,” which 
will vest (referred to as a “payout” below) based on Company revenue performance as against the 2021 PRSU Plan’s 
established  three-year  (years  2021,  2022  and  2023)  compound  annual  growth  rate  (“CAGR”)  of  revenue  as  measured 
against  a  specified  index  of  the  analog semiconductor  industry  CAGR  (the  “Index”).  The level  of performance  of  the 
Company’s three-year revenue CAGR as against the Index is intended to have a difficulty in attainment level consistent 

67 

 
 
 
 
 
     
  
  
  
 
 
 
 
 
 
     
  
  
  
 
with the Company’s 2020 PRSU Plan. The portion of the performance stock units that will vest will be calculated based 
on the Company’s actual three-year revenue CAGR as compared to the Index and awarded in early 2024 upon approval 
by the Compensation Committee. In the event of any mergers, acquisitions or divestitures, or any patent or other litigation 
settlements or judgments, during the performance period, the Company’s target three-year revenue CAGR as against the 
Index shall be adjusted based on a revised plan approved by the Board of Directors. 

No payout will be made in early 2024 under the 2021 PRSU Plan if the Company’s actual three-year revenue 
CAGR does not exceed at least the established minimum amount as measured against the Index as set forth in the 2021 
PRSU  Plan.  To  the  extent  the  Company’s  actual  three-year  revenue  CAGR  exceeds  at  least  the  established  minimum 
amount as measured against the Index as set forth in the 2021 PRSU Plan, the payout increases linearly from zero at the 
minimum CAGR performance level as measured against the Index as set forth in the 2021 PRSU Plan up to 100% when 
the Company’s actual three-year revenue CAGR equals the target at the specified level as set forth in the 2021 PRSU Plan. 
If  the  Company’s  actual  three-year  revenue  CAGR  exceeds  the  target,  then  the  payout  for  performance  above  target 
increases linearly from the target amount up to a maximum of 200% of the target when the Company’s actual three-year 
revenue CAGR equals or exceeds the established amount to achieve the maximum payout as set forth in the 2021 PRSU 
Plan. Except to the extent provided in the executive officer benefits agreements between the Company and each Officer, 
each Officer must be employed by the Company through the end of the performance period to receive stock pursuant to 
the PRSUs under the 2021 PRSU Plan. 

2021 Target PRSUs 

Approved the target 2021 PRSUs for the Officers as follows: 

     Title 

Executive Officer 
Balu Balakrishnan . . . . . . . . . . . . . . . .     President and Chief Executive Officer   
Sandeep Nayyar . . . . . . . . . . . . . . . . . .     Chief Financial Officer 
Radu Barsan . . . . . . . . . . . . . . . . . . . . .     Vice President, Technology 
David “Mike” Matthews . . . . . . . . . . .     Vice President, Product Development   
Ben Sutherland  . . . . . . . . . . . . . . . . . .     Vice President, Worldwide Sales 

2021 Target PRSUs 
30,000 
4,000 
3,300 
2,500 
2,500 

The actual number of shares subject to the PRSUs is twice the target level shown in the table above to enable the 
payout of up to 200% of the target amount if actual net revenue equals or exceeds the established level to achieve the 
maximum amount of the 2021 PRSU Plan. 

2021 Salaries 

Approved the 2021 salaries for the Officers, to be effective at the end of March 2021, as follows: 

Executive Officer 
     Title 
Balu Balakrishnan . . . . . . . . . . . . . . .      President and Chief Executive Officer   $ 
  $ 
Sandeep Nayyar . . . . . . . . . . . . . . . . .      Chief Financial Officer 
Radu Barsan . . . . . . . . . . . . . . . . . . . .      Vice President, Technology 
  $ 
David “Mike” Matthews . . . . . . . . . .      Vice President, Product Development   $ 
  $ 
Ben Sutherland  . . . . . . . . . . . . . . . . .      Vice President, Worldwide Sales 

2021 Salary 
665,000 
410,000 
385,000 
350,000 
350,000 

68 

 
 
 
 
 
     
  
  
  
 
 
 
 
 
 
 
     
 
 
 
 
PART III 

Item 10. Directors, Executive Officers and Corporate Governance. 

The names of our executive officers and their ages, titles and biographies as of the date hereof are set forth under 

the caption “Information About our Executive Officers” in Part I, Item 1, above. 

The following information is included in our Notice of Annual Meeting of Stockholders and Proxy Statement to 
be filed within 120 days after our fiscal year end of December 31, 2020, or the Proxy Statement, and is incorporated herein 
by reference: 

• 

• 

• 

• 

• 

Information regarding our directors and any persons nominated to become a director is set forth under 
the caption “Proposal 1 Election of Directors.” 
Information regarding our audit committee and our designated “audit committee financial expert” is set 
forth under the captions “Information Regarding the Board and its Committees” and “Audit Committee” 
under “Proposal 1 Election of Directors” and “Report of the Audit Committee of the Board.” 
Information on our code of business conduct and ethics for directors, officers and employees is set forth 
under the caption “Code of Business Conduct and Ethics” under “Proposal 1 Election of Directors.” 
Information regarding Section 16(a) beneficial ownership reporting compliance, if any, will be set forth 
under the caption “Delinquent Section 16(a) Reports.” 
Information  regarding  procedures  by  which  stockholders  may  recommend  nominees  to  our  board  of 
directors  is  set  forth under  the  caption  “Nominating  and Governance  Committee” under  “Proposal 1 
Election of Directors.” 

Item 11. Executive Compensation. 

Information regarding compensation of our named executive officers is set forth under the caption “Compensation 

of Executive Officers” in the Proxy Statement, which information is incorporated herein by reference. 

Information regarding compensation of our directors is set forth under the caption “Compensation of Directors” 

in the Proxy Statement, which information is incorporated herein by reference. 

Information relating to compensation policies and practices as they relate to risk management is set forth under 
the caption “Compensation Policies and Practices as They Relate to Risk Management” under “Proposal 1 Election of 
Directors” in the Proxy Statement, which information is incorporated herein by reference. 

Information  regarding  compensation  committee  interlocks  is  set  forth  under  the  caption  "Compensation 
Committee  Interlocks  and  Insider  Participation"  in  the  Proxy  Statement,  which  information  is  incorporated  herein  by 
reference. 

The Compensation Committee Report is set forth under the caption “Compensation Committee Report” in the 

Proxy Statement, which report is incorporated herein by reference. 
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters. 

Information regarding security ownership of certain beneficial owners, directors and executive officers is set forth 
under the caption “Security Ownership of Certain Beneficial Owners and Management” in the Proxy Statement, which 
information is incorporated herein by reference. 

Information  regarding  our  equity  compensation  plans,  including  both  stockholder  approved  plans  and  non-
stockholder approved plans, is set forth under the caption “Equity Compensation Plan Information” in the Proxy Statement, 
which information is incorporated herein by reference. 
Item 13. Certain Relationships and Related Transactions, and Director Independence. 

Information  regarding  certain  relationships  and  related  transactions  is  set  forth  under  the  caption  “Certain 

Relationships and Related Transactions” in the Proxy Statement, which information is incorporated herein by reference. 

Information regarding director independence is set forth under the caption “Proposal 1 - Election of Directors” in 

the Proxy Statement, which information is incorporated herein by reference. 
Item 14. Principal Accounting Fees and Services. 

Information  regarding  principal  auditor  fees  and  services  is  set  forth  under  “Principal  Accountant  Fees  and 
Services” in the Proposal with the caption “Ratification of Selection of Independent Registered Public Accounting Firm” 
in the Proxy Statement, which information is incorporated herein by reference. 

69 

 
Item 15. Exhibits, Financial Statement Schedules 

(a) 

PART IV 

1.  The financial statements required by Item 15(a) are included in Item 8 of this Annual Report on Form 10-K. 

2.  The  financial  statement  schedule  required  by  Item 15(a) (Schedule  II,  Valuation  and  Qualifying  Accounts)  is 

included in Item 8 of this Annual Report on Form 10-K. 

All  other  schedules  are  omitted  because  they  are  not  applicable  or  the  required  information  is  shown  in  the 
consolidated financial statements or notes thereto. 

(b)   Exhibits 

Exhibit 
Number 

Exhibit Description 

3.1  Restated Certificate of Incorporation 

Form 
10-K 

File 
Number 
  000-23441 

Incorporation by Reference 
    Exhibit/Appendix 
Reference 
3.1 

Filing Date 
  2/29/2012   

    Filed 

Herewith 

3.2  Amended and Restated Bylaws 

8-K 

  000-23441 

4.1  Description of Power Integrations, Inc. 

10-K 

  000-23441 

Common Stock 

3.1 

4.1 

  4/26/2013   

  2/6/2020 

4.2  Reference is made to Exhibits 3.1 to 3.2 

10.1*  Form of Indemnity Agreement for directors 

S-1 

  333-35421 

10.1 

  9/11/1997   

and officers 

10.2*  Power Integrations, Inc. Compliance Policy 

10-K 

  000-23441 

10.63 

  3/2/2009 

Regarding IRC Section 409A 

10.3*  1997 Employee Stock Purchase Plan, as 

10-Q 

  000-23441 

10.1 

  10/29/2020   

amended 

10.4*  Forms of agreement under 1997 Employee 

S-1 

  333-35421 

10.5 

  9/11/1997   

Stock Purchase Plan 

10.5*  1997 Outside Directors Stock Option Plan 

10-Q 

  000-23441 

10.6*  Forms of agreement under 1997 Outside 

S-1 

  333-35421 

Directors Stock Option Plan 

10.7*  Form of Director Option Grant Agreement. 

10-Q 

  000-23441 

10.8*  Director Equity Compensation Program 

10-K 

  000-23441 

10.9*  Forms of Stock Option Agreements to be 

10-Q 

  000-23441 

used in Director Equity Compensation 
Program 

10.2 

10.4 

10.9 

10.1 

10.5 

  10/29/2020   

  9/11/1997   

  5/6/2009 

  2/7/2020 

  11/7/2008   

10.10*  Outside Director Cash Compensation 

10-K 

  000-23441 

10.12 

  2/7/2020 

Arrangements 

10.11*  2007 Equity Incentive Plan, as amended and 

10-Q 

  000-23441 

10.3 

  10/29/2020   

restated 

10.12*  Forms of Option Agreements under the 2007 

  Schedule TO   000-23441 

99.(D)(4) 

  12/3/2008   

Equity Incentive Plan 

70 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
   
   
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
10.13*  Form of Restricted Stock Unit Grant Notice 

10-Q 

  000-23441 

10.1 

  5/6/2010 

and Form of Restricted Stock Unit Award 
Agreement under the 2007 Equity Incentive 
Plan 

10.14*  Form of Performance Stock Unit Grant 

10-K 

  000-23441 

10.29 

  2/22/2013   

Notice and Performance Stock Unit 
Agreement (as used after to January 1, 2013) 
under the 2007 Equity Incentive Plan 

10.15*  Form of Long Term Performance Stock Unit 
Notice and Agreement under the 2007 Equity 
Incentive Plan 

10-K 

  000-23441 

10.84 

  2/10/2015   

10.16*  Power Integrations, Inc. Amended and 

10-Q 

  000-23441 

10.4 

  10/29/2020   

Restated 2016 Incentive Award Plan 

10.17*  Form of Restricted Stock Unit Grant Notice 

10-K 

  000-23441 

10.25 

  2/8/2017 

and Agreement under the 2016 Incentive 
Award Plan 

10.18*  Form of Performance Stock Unit Notice and 
Agreement under the 2007 Equity Incentive 
Plan 

10.19*  Form of Long Term Performance Stock Unit 
Notice and Agreement under the 2007 Equity 
Incentive Plan 

10-K 

  000-23441 

10.26 

  2/8/2017 

10-K 

  000-23441 

10.27 

  2/8/2017 

10.21†  Wafer Supply Agreement between us and 

10-Q 

  000-23441 

10.32 

  8/7/2003 

ZMD Analog Mixed Signal Services GmbH 
& Co. KG, dated as of May 23, 2003 

10.22†  Amended and Restated Wafer Supply 

10-Q 

  000-23441 

10.31 

  8/7/2003 

Agreement between us and OKI Electric 
Industry Co., Ltd., dated as of April 1, 2003 

10.23†  Amendment Number One to the Amended 

8-K 

  000-23441 

10.22 

  4/18/2006   

and Restated Wafer Supply Agreement 
between us and OKI Electric Industry Co., 
Ltd., effective as of August 11, 2004 

10.24  Amendment Number Two to the Amended 

10-Q 

  000-23441 

10.5 

  8/8/2008 

and Restated Wafer Supply Agreement 
between Power Integrations International, 
Ltd. and OKI Electric Industry Co., Ltd., 
effective as of April 1, 2008 

10.25  Amendment Number Three to the Amended 
and Restated Wafer Supply Agreement 
between Power Integrations International, 
Ltd. and OKI Electric Industry Co., Ltd., 
effective as of June 9, 2008 

10-Q 

  000-23441 

10.6 

  8/8/2008 

10.26†  Amendment Number Four to the Amended 

10-Q 

  000-23441 

10.2 

  11/7/2008   

and Restated Wafer Supply Agreement 
between Power Integrations International, 
Ltd. and OKI Electric Industry Co., Ltd., 
dated September 15, 2008 

71 

   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
10.27†  Amendment Number Five to the Amended 

10-K 

  000-23441 

10.61 

  3/2/2009 

and Restated Wafer Supply Agreement 
between Power Integrations International, 
Ltd. and OKI Semiconductor Co., Ltd., 
effective as of November 14, 2008 

10.28†  Amendment Number Six to the Amended and 

10-K 

  000-23441 

10.32 

  2/11/2016   

Restated Wafer Supply Agreement between 
Power Integrations International, Ltd. and 
OKI Semiconductor Co., Ltd., effective as of 
November 1, 2015 

10.29†  Amendment Number Seven to the Amended 

10-Q 

  000-23441 

10.1 

  11/1/2016   

and Restated Wafer Supply Agreement 
between Power Integrations International, 
Ltd. and OKI Semiconductor Co., Ltd., 
effective as of August 8, 2016 

10.30†  Amendment Number Eight to the Amended 

10-Q 

  000-23441 

10.1 

  10/26/2017   

and Restated Wafer Supply Agreement 
between Power Integrations International, 
Ltd. and OKI Semiconductor Co., Ltd., 
effective as of July 26, 2017 

10.31††  Amendment Number Nine to the Amended 

10-Q 

  000-23441 

10.2 

  4/25/2019   

and Restated Wafer Supply Agreement, 
between Power Integrations International, 
Ltd. and Lapis Semiconductor Co., Ltd. 
(formerly OKI Semiconductor Co., Ltd.), 
effective as of February 6, 2019 

10.32†  Wafer Supply Agreement, between Seiko 
Epson Corporation and Power Integrations 
International, Ltd. effective as of April 1, 
2005 

10-Q 

  000-23441 

10.1 

  11/7/2008   

10.33†  Amendment Number One to the Wafer 

10-Q 

  000-23441 

10.1 

  5/6/2009 

Supply Agreement between Power 
Integrations International, Ltd. and Seiko 
Epson Corporation, with an effective date of 
December 19, 2008 

10.34†  Amendment Number Two to Wafer Supply 
Agreement, between Seiko Epson 
Corporation and Power Integrations 
International, Ltd., entered into on January 5, 
2011 

10.35†  Amendment Number Three to Wafer Supply 
Agreement, effective as of February 1, 2012, 
by Power Integrations International Ltd. and 
Seiko Epson Corporation 

10.36†  Development Addendum to Wafer Supply 

Agreement, dated September 22, 2013, 
between Seiko Epson Corporation and Power 
Integrations International Ltd 

10-K 

  000-23441 

10.47 

  2/25/2011   

X 

X 

72 

   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
10.37†  Amendment Number Four to Wafer Supply 
Agreement, effective as of April 1, 2015, by 
Power Integrations International Ltd. and 
Seiko Epson Corporation 

10.38†  Amendment Number Five to Wafer Supply 

Agreement, effective as of November 2, 
2015, by Power Integrations International 
Ltd. and Seiko Epson Corporation 

10.39†  Amendment Number Six to Wafer Supply 

Agreement, effective as of December 8, 
2015, by Power Integrations International 
Ltd. and Seiko Epson Corporation 

10.40†  Amendment Number Seven to Wafer Supply 
Agreement, effective as of October 3, 2016, 
by Power Integrations International Ltd. and 
Seiko Epson Corporation 

X 

X 

X 

10-K 

  000-23441 

10.46 

  2/8/2017 

10.41†  Amendment Number Eight to Wafer Supply 

10-K 

  000-23441 

10.47 

  2/8/2017 

Agreement, effective as of November 8, 2016 
by Power Integrations International Ltd. and 
Seiko Epson Corporation 

10.42†  Amendment Number One to the Amended 

10-K 

  000-23441 

10.66 

  2/26/2010   

and Restated Wafer Supply Agreement 
between Power Integrations International, 
Ltd. and XFAB Dresden GmbH & Co. KG, 
effective as of July 20, 2005 

10.43†  Wafer Supply Agreement, made and entered 

10-Q 

  000-23441 

10.2 

  5/8/2012 

into as of October 1, 2010, by and between 
Power Integrations International, Ltd., and X-
FAB Semiconductor Foundries AG 

10.44†  Amendment Number One to Wafer Supply 
Agreement, effective as of January 1, 2014, 
between Power Integrations International, 
Ltd., and X-FAB Semiconductor Foundries 
AG 

10-Q/A 

  000-23441 

10.2 

  9/19/2014   

10.45†  Amendment Number Two to the Wafer 

10-K 

  000-23441 

10.52 

  2/13/2019   

Supply Agreement, effective as of December 
1, 2018, between Power Integrations 
International, Ltd., and X-FAB 
Semiconductor Foundries GmbH (formerly 
X-FAB Semiconductor Foundries AG) 

10.46  Credit Agreement, dated July 27, 2016, by 

10-Q 

  000-23441 

10.1 

  7/29/2016   

and between Power Integrations Inc. and 
Wells Fargo Bank, National Association 

10.47  First Amendment to Credit Agreement, dated 
April 30, 2018 by and between Power 
Integrations, Inc. and Wells Fargo Bank, 
National Association 

10-Q 

  000-23441 

10.1 

  7/26/2018   

73 

 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
10.48*  2019 Executive Officer Compensation 

10-K 

  000-23441 

Item 9B 

  2/13/2019   

Arrangements and 2019 Performance Based 
Incentive Plan 

10.49*  2018 Executive Officer Cash Compensation 
Arrangements and 2018 Performance Based 
Incentive Plan 

10-K 

  000-23441 

Item 9B 

  2/14/2018   

10.50*  Form of Restricted Stock Unit Grant Notice 

10-Q 

  000-23441 

10.6 

  8/6/2010 

and Form of Restricted Stock Unit Award 
Agreement for executive officers for use 
prior to January 2013 

10.51*  Form of Restricted Stock Unit Grant Notice 

10-K 

  000-23441 

10.48 

  2/22/2013   

and Form of Restricted Stock Unit Award 
Agreement for executive officers for use after 
January 2013 

10.52*  Amended and Restated Chief Executive 

10-Q 

  000-23441 

10.3 

  5/5/2014 

Officer Benefits Agreement, dated as of May 
1, 2014, between Power Integrations, Inc. and 
Balu Balakrishnan 

10.53*  Amended and Restated Executive Officer 

10-Q 

  000-23441 

10.5 

  5/5/2014 

Benefits Agreement, dated as of May 1, 
2014, between Power Integrations, Inc. and 
Cliff Walker 

10.54*  Amended and Restated Executive Officer 

10-Q 

  000-23441 

10.6 

  5/5/2014 

Benefits Agreement, dated as of May 1, 
2014, between Power Integrations, Inc. and 
Doug Bailey 

10.55*  Amended and Restated Executive Officer 

10-Q 

  000-23441 

10.7 

  5/5/2014 

Benefits Agreement, dated as of May 1, 
2014, between Power Integrations, Inc. and 
Ben Sutherland 

10.56*  Amended and Restated Executive Officer 

10-Q 

  000-23441 

10.8 

  5/5/2014 

Benefits Agreement, dated as of May 1, 
2014, between Power Integrations, Inc. and 
Sandeep Nayyar 

10.57*  Amended and Restated Executive Officer 

10-Q 

  000-23441 

10.10 

  5/5/2014 

Benefits Agreement, dated as of May 1, 
2014, between Power Integrations, Inc. and 
Mike Matthews 

10.58*  Amended and Restated Executive Officer 

10-Q 

  000-23441 

10.11 

  5/5/2014 

Benefits Agreement, dated as of May 1, 
2014, between Power Integrations, Inc. and 
Radu Barsan 

10.60††  ON Semiconductor Corporation Settlement 

10-K 

  000-23441 

10.61 

  2/7/2020 

Agreement 

10.61††  ON Semiconductor Corporation Term Sheet   

10-K 

  000-23441 

10.62 

  2/7/2020 

74 

 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
10.62†  Amendment Number Ten to the Amended 

10-Q 

  000-23441 

10.1 

  5/7/2020 

and Restated Wafer Supply Agreement, 
between Power Integrations International, 
Ltd. and Lapis Semiconductor Co., Ltd. 
(formerly OKI Semiconductor Co., Ltd.), 
effective as of December 16, 2019 

10.63†  Amendment Number Eleven to the Amended 
and Restated Wafer Supply Agreement, 
between Power Integrations International, 
Ltd. and Lapis Semiconductor Co., Ltd. 
(formerly OKI Semiconductor Co., Ltd.), 
effective as of December 20, 2019 

10-Q 

  000-23441 

10.2 

  5/7/2020 

10.64†  Amendment Number Nine to Wafer Supply 

10-Q 

  000-23441 

10.3 

  5/7/2020 

Agreement, effective as of November 1, 2017 
by Power Integrations International Ltd. and 
Seiko Epson Corporation 

10.65*  2020 Compensation Arrangements with 

10-K 

  000-23441 

Item 9B 

  2/7/2020 

Named Executive Officers 

10.66*  Amendment to the Amended and Restated 

10-Q 

  000-23441 

10.2 

  7/30/2020   

Executive Officer Benefits Agreement, dated 
as of June 1, 2020, between Power 
Integrations, Inc. and Balu Balakrishnan 

10.67*  Amendment to the Amended and Restated 

10-Q 

  000-23441 

10.3 

  7/30/2020   

Executive Officer Benefits Agreement, dated 
as of June 1, 2020, between Power 
Integrations, Inc. and Douglas Bailey 

10.68*  Amendment to the Amended and Restated 

10-Q 

  000-23441 

10.4 

  7/30/2020   

Executive Officer Benefits Agreement, dated 
as of June 1, 2020, between Power 
Integrations, Inc. and Radu Barsan 

10.69*  Amendment to the Amended and Restated 

10-Q 

  000-23441 

10.5 

  7/30/2020   

Executive Officer Benefits Agreement, dated 
as of June 1, 2020, between Power 
Integrations, Inc. and Ben Sutherland 

10.70*  Amendment to the Amended and Restated 

10-Q 

  000-23441 

10.6 

  7/30/2020   

Executive Officer Benefits Agreement, dated 
as of June 1, 2020, between Power 
Integrations, Inc. and Mike Matthews 

10.71*  Amendment to the Amended and Restated 

10-Q 

  000-23441 

10.7 

  7/30/2020   

Executive Officer Benefits Agreement, dated 
as of June 1, 2020, between Power 
Integrations, Inc. and Sandeep Nayyar 

10.72*  Amendment to the Amended and Restated 

10-Q 

  000-23441 

10.9 

  7/30/2020   

Executive Officer Benefits Agreement, dated 
as of June 1, 2020, between Power 
Integrations, Inc. and Clifford Walker 

10.73*  Executive Officer Benefits Agreement, dated 
as of February 1, 2020, between Power 
Integrations, Inc. and Sunil Gupta 

75 

X 

 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
10.74  Amendment Number Ten to Wafer Supply 
Agreement, effective as of August 26, 2020 
by Power Integrations International Ltd. and 
Seiko Epson Corporation 

21.1  List of subsidiaries 
23.1  Consent of Independent Registered Public 

Accounting Firm 

24.1  Power of Attorney (see signature page) 
31.1  Certification of Chief Executive Officer 
pursuant to Section 302 of the Sarbanes-
Oxley Act of 2002 

31.2  Certification of Chief Financial Officer 
pursuant to Section 302 of the Sarbanes-
Oxley Act of 2002 

32.1**  Certification of Chief Executive Officer 
pursuant to Section 906 of the Sarbanes-
Oxley Act of 2002 

32.2**  Certification of Chief Financial Officer 
pursuant to Section 906 of the Sarbanes-
Oxley Act of 2002 
101.INS  XBRL Instance Document 
101.SCH  XBRL Taxonomy Extension Schema 

Document 

101.CAL  XBRL Taxonomy Extension Calculation 

Linkbase Document 

101.DEF  XBRL Taxonomy Extension Definition 

Linkbase Document 

101.LAB  XBRL Taxonomy Extension Label Linkbase 

Document 

101.PRE  XBRL Taxonomy Extension Presentation 

Linkbase Document 

104  The cover page from this Annual Report on 
Form 10-K, formatted in Inline XBRL. 

10-Q 

  000-23441 

10.5 

  10/29/2020   

X 
X 

X 
X 

X 

X 

X 

X 
X 

X 

X 

X 

X 

X 

All references in the table above to previously filed documents or descriptions are incorporating those documents 

and descriptions by reference thereto. 

†  This Exhibit has been filed separately with the Commission pursuant to an application for confidential treatment. The 

confidential portions of this Exhibit have been omitted and are marked by an asterisk. 

††  Portions of this exhibit have been omitted as being immaterial and would be competitively harmful if disclosed. 

* 

Indicates a management contract or compensatory plan or arrangement. 

**  The certifications attached as Exhibits 32.1 and 32.2 accompanying this Form 10-K, are not deemed filed with the 
SEC, and are not to be incorporated by reference into any filing of Power Integrations, Inc. under the Securities Act 
of 1933, as amended, or the Securities Exchange Act of 1934, as amended, whether made before or after the date of 
this Form 10-K, irrespective of any general incorporation language contained in such filing. 

Item 16. Form 10-K Summary 

Not provided. 

76 

 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to 

be signed on its behalf by the undersigned thereunto duly authorized. 

      POWER INTEGRATIONS, INC. 

SIGNATURES 

Dated: February 5, 2021 

  By: 

/s/ SANDEEP NAYYAR 
Sandeep Nayyar 
Chief Financial Officer (Duly Authorized Officer, 
Principal Financial Officer and Chief Accounting 
Officer) 

77 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
POWER OF ATTORNEY 

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes 
and appoints Balu Balakrishnan and Sandeep Nayyar his or her true and lawful attorney-in-fact and agent, with full power 
of substitution and, for him or her and in his or her name, place and stead, in any and all capacities to sign any and all 
amendments to this Report on Form 10-K, and to file the same, with all exhibits thereto and other documents in connection 
therewith, with the Securities and Exchange Commission, granting unto said attorney-in-fact and agent full power and 
authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as 
fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said 
attorney-in-fact and agent, or his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof. 

PURSUANT TO THE REQUIREMENTS OF THE SECURITIES EXCHANGE ACT OF 1934, THIS REPORT 
HAS  BEEN  SIGNED  BY  THE  FOLLOWING  PERSONS  ON  BEHALF  OF  THE  REGISTRANT  AND  IN  THE 
CAPACITIES AND ON THE DATES INDICATED. 

Dated:  February 5, 2021 

Dated:  February 5, 2021 

Dated:  February 5, 2021 

Dated:  February 5, 2021 

Dated:  February 5, 2021 

Dated:  February 5, 2021 

Dated:  February 5, 2021 

Dated:  February 5, 2021 

Dated:  February 5, 2021 

/s/ BALU BALAKRISHNAN 
Balu Balakrishnan 
President, Chief Executive Officer 
(Principal Executive Officer) 

/s/ SANDEEP NAYYAR 
Sandeep Nayyar 
Chief Financial Officer 
(Principal Financial and Principal Accounting 
Officer) 

/s/ WILLIAM GEORGE 
William George 
Director and Chairman of the Board 

/s/ WENDY ARIENZO 
Wendy Arienzo 
Director 

/s/ NICHOLAS E. BRATHWAITE 
Nicholas E. Brathwaite 
Director 

/s/ ANITA GANTI 
Anita Ganti 
Director 

/s/ BALAKRISHNAN S. IYER 
Balakrishnan S. Iyer 
Director 

/s/ NECIP SAYINER 
Necip Sayiner 
Director 

/s/ STEVEN J. SHARP 
Steven J. Sharp 
Director 

 By: 

By: 

By: 

By: 

By: 

By: 

By: 

By: 

By: 

78 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balu Balakrishnan 
President and Chief Executive Officer

Corporate Counsel 
Cooley LLP 
Palo Alto, CA

Doug Bailey 
Vice President, Marketing

Radu Barsan 
Vice President, Technology

Sunny Gupta 
Vice President, Operations

Mike Matthews 
Vice President, Product Development

Sandeep Nayyar 
Vice President, Finance 
Chief Financial Officer

Ben Sutherland 
Vice President, Worldwide Sales

Clifford J. Walker 
Vice President, 
Corporate Development

Transfer Agent 
Computershare 
P.O. Box 30170 
College Station, TX 77842-3170

Independent Auditors 
Deloitte & Touche LLP 
San Jose, CA

Investor Information 
For additional information about 
Power Integrations, visit: 
www.power.com

Investor Relations 
Investor Relations Department 
Power Integrations, Inc. 
5245 Hellyer Avenue 
San Jose, CA 95138 
ir@power.com

William L. George (Chairman) 
Former Executive Vice President 
ON Semiconductor Corporation, 
Retired

Wendy A. Arienzo 
Vice President, Operations 
FUJIFILM Dimatix, Inc.

Balu Balakrishnan 
President and Chief Executive Officer 
Power Integrations, Inc.

Nicholas E. Brathwaite 
Partner, Riverwood Capital LLC

Anita Ganti 
Former Senior Vice President, 
Product Engineering Services 
Wipro Limited

Balakrishnan S. Iyer 
Former Senior Vice President  
and Chief Financial Officer 
Conexant Systems, Inc., Retired

Jennifer A. Lloyd 
Vice President,  
Precision Platforms  
and Technology Group 
Analog Devices, Inc.

Necip Sayiner 
Former Executive Vice President 
Renesas Electronics Corporation 

Steven J. Sharp 
Former Chairman and CEO 
TriQuint Semiconductor, Inc., Retired

Power Integrations, Inc. 5245 Hellyer Avenue, San Jose, CA 95138 www.power.com
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All rights reserved.

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